SOLUTION: Solve the system by addition or substitution. 9x+3y=24 y=8-3x

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Question 121437: Solve the system by addition or substitution.

9x+3y=24
y=8-3x
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
y=8-3x now replace y with (8-3x) in the other equation.
9x+3(8-3x)=24
9x+24-9x=24
9x-9x=24-24
0=0 therefore there are no unique solutions as these 2 line equations are parallel or the same line as follows:
+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+y+=+-3x+%2B8%2C+y+=-3x+%2B8+ (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = -3x +8 and y = -3x +8).