SOLUTION: solve the system of equations by substitution
y=3x+7
y=x-9
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Question 865013: solve the system of equations by substitution
y=3x+7
y=x-9
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
y=3x+7 ... start with the first equation
x-9=3x+7 ... plug in y = x-9
x-9-7=3x
-9-7=3x-x
-16=2x
2x=-16
x=-16/2
x=-8
------------------------------
Now use this to find y
y=x-9
y=-8-9
y=-17
So the solutions are x=-8 and y=-17
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