Could any work out these equations using the substitution method please:

1.
x= 6y-2 equation 1
8y- 3x = 1 equation 2


2.
t = 1 - 7s equation 1
5s - 3t = 10 equation 2

3.
3p + 7q = 11 equation 1
p - q = -4 equation 2


4.
2d + e = -8 eqaution 1
6d - 2e = -27 equation 2


thanks

 

1. y=1.6 x=7.6
2. s=0.5 t=-2.5

 

3. q=2.3 so p =-1.7
4. d=-4.3 e=0.6

 

thanks
how did you come to the conclusion?

 

Man do your own homework.You know teachers gona find out and be pissed

 

Dude, do you or your child seriously have a problem in substituting into equations? Getting someone to do it isn't going to solve your problem. Go to your teacher/lecturer and get them to help you

 

My kid says the teacher doesnt explain things very well, and almost everyone in her class doesnt understand, shes only in year 8!

Thanks anyway.

 

Jeez, go easy on the guy, he might just want answers to compare, to make sure his are right

 

Is many years since i did it last but I come to a different solution to the one posted above.

Q1. X=1 and Y=0.5

Workings: Substitute x in terms of y so the first part now reads:

8y - 3(6Y-2) = 1

Multiply out the brackets to give:

8y - 18y + 6 = 1

Subtract 6 from both sides:

8y - 18y = - 5

-10y = - 5

Divide both sides by 10:

- y = - 5/10

Multiply both sides by -1:

y = 5/10 = 0.5

Feeding y=0.5 into original equation for x:

x = 6 x 0.5 - 2

x = 3 - 2

x = 1

Hopefully you can do the other 3 questions yourself!

 

Tell the school then bud because it won't help matters especially when they get onto harder stuff and will need to make substitutions for other problems. I am currently at uni doing a mechanical engineering degree and I have core maths modules so I'd like to think I know my stuff. From experience, you have to nail these things on the head right from the beginning to I would go to the teacher and tell him/her your child has a problem and to help her sort it out. If the teacher is at fault for not being able to explain properly try addressing the head of department.

 

Jimbo's right, for some reason I got 8y -16y instead of 8y -18y??? my bad

 

My daughter says thanks for the help and gives you a hi5,

She also asked me to tell everyone else thanks for refreshing her memory.

ricky

 

ricky, the other answers I got are correct, just ran them through a calculator, just the 1st that was out, if she needs to compare

 

Let us know if you get stuck on the rest but hopefully if you use the same method all will work out okay.

 

do you need the rest doing?? these are quite simple once you know the "rules".

 

i have suss it now thanks

 

oh my god im one thick coont not one piece of anything above made any sence whatsoever

 

You're not thick mate, you've just never done it before. If you don't know the rules it makes no sense at all.

 

all the people giving him a hard time actually didn't see where he wrote

"thanks
how did you come to the conclusion?"

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