Question 16294: can you please help me with {x+12y=68
{x=8y-12
Answer by pwac(253)   (Show Source):
You can put this solution on YOUR website! x+12y=68 ----(1)
x=8y-12 ----(2)
These are linear equations that can be solved using substitution
Substitute value of x in (1)with that in (2)to get:
(8y-12)+12y=68 bracket there to highlight what has been done
8y-12+12y=68 add 12 to both sides to remove -12 on left
8y+12y=80 add y-terms together
20y=80 divide both sides by 20
y=4
Now substitute y in(2)with 4 to get
x=8times4-12=32-12
x=20
hope you understand
Pete
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