Question

solve the system by the addition method :

-3x+7y=-9
27x-63y=82

Answer 1

I doubt if there is a possible solution
-3x+7y=-9 -(1)
27x-63y=82 -(2)
(1)x9 +(2)
9(-3x+7y) +(27x-63y) = -9 (9) +82
-27x +63y +27x -63y = -81 +82
0 = -1
Alright that's what i got :S

Answer 2

what does x = and what does y =

Answer 3

-3x+7y=-9 => x = (9+7y) /3 -(1)
27x-63y=82 -(2)
Sub. (1) into (2)
27 [(9+7y) /3] - 63y =82
81 +63y - 63y =82
81 = 82

Alright what do you think for the answer then?

Answer 4

okay
thanks

Answer 5

Welcome