Answers

2016-03-11T10:03:20+05:30
9a(1) + 12 a (-1) = 63
9a - 12a= 63
-3a = 63
 a = 63/-3
a= -12
1 5 1
2016-03-11T14:01:18+05:30
The answer of this question is -21
because x=1
y=-1
9a(1)+12a(-1)=63
9a+(-12a)=63
9a-12a=63
-3a=63
-a=63/3
-a=21
a=-21
hope it is helpful.
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