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aliina [53]
3 years ago
10

Are lines y=-x-4 and 5x+5y=20 perpendicular?

Mathematics
1 answer:
coldgirl [10]3 years ago
6 0
The lines consider perpendicular if (the slope of line 1) * (the slope of line 2) = -1 
so get the slope of the lines ,1st put the equation on the form of y = mx+c 
where the coefficient of x (m) is the slope
y=-x-4 .... m1= -1
5x+5y=20
y=-x+4 .... m2 = -1
so m1 * m2 = -1 * -1 = 1
then, the two lines aren't perpendicular  
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