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Mathematics
London Craig
25 June, 20:24
Are lines y=-x-4 and 5x+5y=20 perpendicular?
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Kaila Briggs
25 June, 22:06
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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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