SOLUTION: X-7y=56+y 0.09y=0.03x-0.78 Solve the system I don't understand? please anyone help. thanks

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Question 94771: X-7y=56+y
0.09y=0.03x-0.78
Solve the system
I don't understand? please anyone help. thanks
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
solving the system means finding values for x and y that work in both equations

x-7y=56+y ... x=56+8y ... multiplying the second equation by 100 gives 9y=3x-78

substituting gives 9y=3(56+8y)-78 ... 9y=168+24y-78 ... -15y=90 ... y=-6

x=56+8(-6) ... x=56-48 ... x=8