SOLUTION: 3x-6y=30 y=-6x=34

Algebra ->  College  -> Linear Algebra -> SOLUTION: 3x-6y=30 y=-6x=34      Log On


   

Question 151863: 3x-6y=30
y=-6x=34
Found 2 solutions by jojo14344, hitchick247:
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
3x-6y=30
y=-6x=34
Re-writing:
3x-6y=30 ----------------------------> eqn 1
y=-6x-34 ----------------------------> eqn 2
Substitute eqn 2 in eqn 1:
3x-6%28-6x-34%29=30
3x%2B36x%2B204=30
39x=30-204
39x=-174 -----> cross%2839%29%2Ax%2Fcross%2839%29=cross%28-174%29%2A4.4615385%2Fcross%2839%29
x=-4.4615385
For y in eqn 2:
y=-6%28-4.4615385%29-34
y=-7.2307692
To check via eqn 1:
3%28-4.4615385%29-6%28-7.2307692%29=30
-13.384616%2B43.3841615=30
30=30
Thank you,
Jojo

Answer by hitchick247(3) About Me  (Show Source):
You can put this solution on YOUR website!
subtract the 3 to get it on the other side of the equals sign
making the problem say -6y= -3x + 30
divide the -6 from everything
y= (1/2)x - 5