In the xy-plane, line k and line p intersect at 90-degree angles. If t

Question

In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

Archit3110 · Answer

for two lines which are perpendicular to each other i.e. intersect at 90 degree product of their slopes has to be equal to -1

so m1*1/2= -1
m1= -2 IMO A

dave13 · Answer

the slopes of perpendecular lines are negative reciprocals of each other: m1*m2 = -1

So,  m1*\frac{1}{2} =-1

M1 = -2

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