₦airaland Forum

goofyone:
One other question type you can use the substitution method for is SIMULTANEOUS EQUATIONS.
In an exam like JAMB, it's not recommend to try to solve simultaneous equations from the ground up. Options are provided for you and if you can, use these options to quickly narrow down your answers to the correct option.

Take for example this JAMB question:

Solve the equations
m² + n² = 29
m + n = 7

A. (2, 3) and ( 3, 5)
B. (2, 5) and (5, 2)
C. (5, 2) and ( 5, 3)
D. (5, 3) and (3, 5)


A usual attempt at finding m & n may require you to start solving equation. You'll obtain a quadratic equation that will then feed you with options for m (or n). You can then substitute to obtain your answer for the other unknown.
In an exam like WAEC (theory section), you certainly should go through all the solution steps. But in JAMB, use your shortcut method.

I'll not attempt to solve this question the usual way. I'll just go straight to using the substitution method.

So, you look at the question again:

m² + n² = 29
m + n = 7

And you look at the options again:

A. (2, 3) and ( 3, 5)
B. (2, 5) and (5, 2)
C. (5, 2) and ( 5, 3)
D. (5, 3) and (3, 5)

You immediately realize that in order for an option to be correct, the answer has to work for both solutions in the bracket. You immediately see that "A" can't be correct, since 2 + 3 = 5 (and not 7). At this stage, you want to stop bothering about the next bracket in option "A". It says "and" between them, so both options MUST be correct. Since the first bracket is not correct, don't even bother with the second bracket.

Look at option "B". 2 + 5 = 7 and that's good. Again, 2² + 5² = 4 + 25 = 29 and that's also good. The second bracket is merely a reversal of the first bracket and gives the same answers as earlier.

It is at this stage, you want to ignore the remaining options (provided you are confident of your solution) and just move on. If you are like me and you are not completely sure of that option "B" as the answer, then by all means test the remaining options. But you need to be fast. You'll quickly see that for option "C", even though (5,2) is correct, (5,3) is not as 5 + 3 = 8 (and not 7).
Also option D is completely way off for the two brackets.

So "B" is indeed the answer. All of this should have taken you less than a minute.

Again, you really do not have to go through a complete solution step in solving a question like this. I'll find more questions of this type and post it for you to apply this substitution method.

We'll be talking about another method of JAMB maths quick solution in the next couple of posts. I call this the "ELIMINATION METHOD".

Dude am in love with you{[No homo]..but you have really simplified everything & I can not waste time in maths.. Taking jamb next year has given me headache cos its CBT& secondly with it taking much of my time..but with your tutoring no more time wasting..

I will post a quick solution on some profit&loss problems when we get to that topic

goofyone:
Do you mean the substitution method?

Yeah I used ur method & I solved a question within 45secs..thanks..pls forget about log&move on ..its only 1 question & you've solved the most difficult ones..we can read up the most rest

raayah:
Could you rephrase this question.

alright forget it,I have resolved it with the initial method&I got it..found out my mistake..thanks

My mistake,your method is fast..thanks..works perfectly

S

At times its good at times is bad..my uncle wanted his son to marry His tenant (the tenant has lived in his house for around 30yrs) so they were not just tenants but family friends.but my aunt opposed the marriage all in the name that the so called tenant would be an in law..trying to reap where she didn't sow..his brother's(igbo)marriage was frowned at jux b/c he married a Benin girl & so on..even my parents esp my grandma is highly against marrying from another place if not my village all b/c they want to have an in law from my village without considering happiness.. Hate things like this

Z alyt

Wait oo! Op,is preaching meant to be comfortable?its suppose to be supportive & calling those who deviated back to God...nawa to you oo

Anybody that says oil&gas eng. Sit in office&earn fat salaries is crazy..its jux like saying that b/c doctors&nurses earn fat salaries they sit in office.then until you visit hospitals or u having Sm1 related to u being 1,u would see that they stand up 5hrs without sitting down working.they forsake sleeps for midnight calls,forsake food jux to save sm1s life,running to&fro during emergencies..doctors&Nurses spend countless hours in theaters operating.imagen removing the spinal cord 1 by 1 jux to work on a particular problem&after,start fixing them all 1 by 1.its tedious&it worths the money they are being paid..jux b/c other sectors of engineering are not paying well as oil&gas doesnt mean those there are Lazy

Elxandre:
Become a credible inventor, and you earn what he has been gathering up all these years in a shorter while if you are lucky.

Inventing isn't for the meek hearted though, as the rewards may tarry, but will be worth it when they come through.

There is no wrong in getting a job initially though, as you need money to start off in life, especially if you are from a not too rich family.

Dude,i understnd& as a Nigerian i love monopoly..lets look at the manufaturers of Zmapp..they can charge countries Millions of dollars jux b/c they invented ebola drug...the main point was that US govt. Sponsored their idea of invnting the vaccine..my uncle told me mother that US govt. Pay the inventor of gun's family a ertain amt jux for inventing Gun... I wouldnt go into Oil&Gas if i invent smth that could make the world a better place&fetch me double the amouth @Oil&Gas

Op,you're right but who no want better life..my big couz who studied mech.eng. Works in schulmberg in Kenya..last he was working in port,anoder london,anoder Netherland,anoder Dubia&so on..he changes cars like clothes..he recently refused to wed in my villa,cos he has rich frends in port who go gve him smth,i hav never seen him in my life time enter bus&many more is what hes life has been since he entered oil/gas sector&you want me to finsh my education&come dey invent wat?thats wat Nigeria is for you

I think he had a good season..congrats to the best player on the planet

redcliff: Which private school collects 20-30k per term? Any private school tgat collects less than 120k per term na bullszhit scul wannabe.

dude get ur facts b4 u talk wetin u no knw..i went to University of Nigeria Secondary school Enugu&we paid 50k..the schl was the best in waec in my State and was 3rd all over Nigeria.last yr the schl had the best student in Neco..this yr,a student got 9as in waec.chek COWBELL maths competitons&See the schl who has been topping charts....get ur facts rite b4 u type..Thanks.to back up my points,here http://www.punchng.com/education/boy-15-wins-national-mathematics-contest/

Nyc move

Missy89: Nigerians can overreact eh!

Why use patients as lab rats on a drug that was developed by vague scientist?

so american scientists have 2 heads?i have said it,untill we learn to appreciate wat we hav,Nigeria is still a long way of being wat we want..ode

fg govt cant jus come out of the blues and approve drugs like..if the drug has the ability of killin the ebola and at the same time doesnt kill the patient,weda na ota pia pia,me no mind

tuoyoojo: 2 nurses haved died, a doctor too gone. What did people say RIP. Shekina.very soon like other people who hav died in active service for the country, they wud end up as gist for people in beer parlours.

Why shud a health professional risk his or her life for a country which doesn't care for its own.patriotism is not cheap.its very expensive

By the way, ask urself,
Who r the people caring for the 12 ebola cases? R they doctors or what. Who is the person who invented the nano silver drug. Is he a doctor.(Correct me if am wrong) the same doctors, that many people here castigate.they same ones r working.

If u were a doctor, wud u expose urself to ebola, when u know dat in d case of eventualities u r one ur own.na only eya dem go tell u.

Lest I forget,people wud be quick to say doctors hav sworn an oath to save lives, even if it puts der lives at risk, they shud still go on and save lives shey. Wen our military men r being killed with reckless abadon by bh,what hav u guys being saying "let the die, they r corrupt".

When the US had 2 of their citizens infected,they flew dem back to the states and treated dem. If I were in d US, tell me what wud stop me from being patriotic? What wud stop me from laying my life down for the betterment of my country

Doctors refuse to go with d status quo, if the other essential service providers r ok with their poor conditions of service, by all means they shud continue.

Give d doctors what they want, if after some time u don't see improvement, na me go join una to castigate dem

For now I just dey observe , let's see who blinks 1st

dude,you just talked like a primary2 pupil...so cos the job of a police officer is to save life,dat gves him the right to demand 2million per annum salary?...i smell ebola

prettyprettywow: That is where everybody's problem lies. Hazard allowance and other allowances are not the problem, but trying to subdue others is the main problem

yea.buh dont think fg pulling stunts like this,is gonna come any where close to ending the strike..jus making noise

lrguru: thank you jare

so u tink its an eay move..why didnt they try it with ASUU..enter unversity replace all lecturers?

Doctors deserve every single penny they get.Some NL should stop hating on them.if u grew up with along side them,u gona understand..where my problem lies is their demand which is to monopolise the sector

prettyprettywow: call Drs on phone, and they diagnose your ailment and prescribe via phone without physical examination and lab investigations?. Lol. I weep for una

people really think being intelligent is sweeping As&Bs..well thats not that..am not in the medical line,buh my mum who's a nurse prescribes drugs via phone so don't tell me that..so wat u telling me that is if u have running stomach,dat ur family doc cant prescribe drugs for u via telephone...na wa oo!!