Explanation:
for x=8,y=4
4=8x-4
8x=4+4
8x=8
x=1
y=8 (8)-4
y=64-4
y=60
for x=0.5, y= -4
-4=8x-4
8x= -4+4
8x=0
x=0
y=8 (0.5)-4
y=4-4
y=0
for x=2,y=-4
8x=4-4
y=8 (2)-4
y=16-4
y=12
for x= -4,y=8
8=8x-4
8x=8+4
8x=12
x=1.5
y=8 (-4)-4
y= -32-4
y= -36
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