Question 507512
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.