Asked by Mike

Use substitution to solve the linear system.

3x+4y=27
y=x-2
Answered by Anna-Marie
3x+4(x-2)=27

3x+4x-8=27

7x-8=27

7x=35

x=5
Answered by Anna-Marie
y=3
Answered by Mike
thx

Same as first one except choices i got B is this correct. If not what is it and how do you get this answer?

3x+4y=-11
y=-x-2

A. (-5,1) B.(4,-6) C. (3,-5)
D. No Solution
Answered by Anna-Marie
the answer is C

3x+4(-x-2)=-11

3x-4x-8=-11

-1x-8=-11

-1x=-3

x=3

y= -(3)-2

y=-5

any questions?
Answered by Mike
Ahhh i miss coulculated.

one more i thank im geting the hang of it now tho.

y=x-2
y=2x
Answered by Anna-Marie
set it up like this

x-2=2x

then x=-2
Answered by Mike
does y=0
Answered by drwls
No , y is not zero. It is twice x
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