y-4=4x+3y=-(9-x) What is the value of xy?

what are we to make of the two = signs?

I believe it's like: y-4=4x+3y y-4=-(9-x) 4x+3y=-(9-x)

well, then we have y-4 = 4x+3y 2y = -4x-4 y = -2x-2 y-4 = -(9-x) y-4 = x-9 y = x-5 So, -2x-2 = x-5 x = 1 and thus y = -4 xy = -4

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