SOLUTION: solve by the substitution method 3x+5y=21 x=51-9y

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Question 355410: solve by the substitution method
3x+5y=21
x=51-9y
Answer by checkley77(12844) About Me  (Show Source):
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3x+5y=21
x=51-9y
3(51-9y)+5y=21
153-27y+5y=21
-22y=21-153
-22y=-142
y=-132/-22
y=6 ans.
x=51-9*6
x=51-54
x=-3 ans.
3*-3+5*6=21
-9+30=21
21=21