SOLUTION: solve the system of equations by the substitution method: y=7x+9 y=9x+10

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Question 982041: solve the system of equations by the substitution method:
y=7x+9
y=9x+10
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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7x+9=9x+10
-1=2x
-1/2=x
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CHECK:
y=7x+9
y=7(-1/2)+9
y=-7/2+18/2
y=11/2
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y=9x+10
11/2=9(-1/2)+20/2
11/2=-9/2+29/2
11/2=11/2