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y=-x-4

as this is in the form of y=mx+b, the slope of this line is -1.

5x + 5y = 20

x + y = 4

y = -x + 4

the slope of this line is -1.

Since the slope of each of the two lines are the same (-1) they are in fact parallel to each other, not perpendicular.

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Q: Are the lines y equals negative x minus 4 and 5x plus 5y equals 20 perpendicular explain your answer?
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