SOLUTION: (5x-y) (3-(6-xy-6)) : x=7, y=-1 How do I solve this?

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Question 507512: (5x-y) (3-(6-xy-6)) : x=7, y=-1
How do I solve this?
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute the values x=7 and y= -1.
Then do the arithmetic.
.
(5x -y)*(3 -(6 -x*y -6) = 0
.
(5x-y) = (5*7 - (-1)) = 35 +1 = 36
.
(6 -x*y -6) = 6 - (7)(-1) - 6 = 6 +7 -6 = 7
.
(5x -y)*(3 -(6 -x*y -6) = 36*(3-7) = 36(-4) = -144
.
Done.