SOLUTION: Sorry Jon! It is x + 7y = -39 -3x - 2y = 22 Substitution method ,I can't get it to work out.

Question 3869: Sorry Jon!
It is
x + 7y = -39
-3x - 2y = 22
Substitution method ,I can't get it to work out.
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
let 2 eqns be eqn1 and eqn2, respectively.

in eqn1, x = -39 - 7y. So put this (ie substitute it) into the second eqn, which becomes:

-3(-39-7y) - 2y = 22 --> expand the bracket and simply it all:
117+21y - 2y = 22
19y = 22-117
19y = -95
y = -95/19
y = -5.

So now put this into either eqn1 or eqn2..pick the easiest looking one!... eqn2

This becomes -3x -2(-5) = 22
-3x + 10 = 22
-3x = 22-10
-3x = 12
x = -12/3
x = -4

Now but both answers into the other eqn and see if you do get -39. If you do, you KNOW the answer is correct!

-4 + 7(-5)
-4 - 35
-39 --> CORRECT!!

jon.

RELATED QUESTIONS
substitution method? Can someone please help! x+7y= -39 -3y-2y=... (answered by longjonsilver)

x=y+3 3x-2y=4. I did get to work this problem out and hopefully it is right but I do not (answered by jim_thompson5910)

how do I solve x + 7y = 39 and 3x - 2y = 2 by using substitution? (answered by checkley79)

Solve the system by the elimination method. I need to see it worked out. Answer I'm... (answered by richwmiller)

I can't get the answer to the following problem ; y-5x=-2 3x-7y=22 The... (answered by Alan3354,KMST)

When solving Linear Systems algebraically, there are the three main methods;... (answered by alaccalac)

Ok so I've tried to do this problem quite a few times and I just can't seem to get it.... (answered by stanbon,solver91311)

What is the value of x? https://i.ibb.co/5FdV518/2.jpg (Sorry I don't know how to... (answered by josgarithmetic,math_tutor2020,greenestamps)

Which expression can be substituted for x in the top equation of the system to solve the... (answered by addingup)