Question

Two perpendicular lines intersect at the origin. If the slope of the first line is , what is the equation of the second line?
A y=-2x
b y=1/2x
c y=-1/2x
d y=2x

Answer 1

the first slope is -1/2

Answer 2

for perpendicular lines..m1*m2=-1
here m1=-1/2
so m2=2
so the equation of the line is...(y-y1)=m2*(x-x1)
the line goes through (0,0)
so y1=0 and x1=0
the equation is y=2x