the slope of the first is -7/2
the slope of the second is -4/d
to be perpendicular they must be negative reciprocals of each other, or their product must be -1
solve (-7/2)(-4/d) = -1
The line 2y+7x=5 and 4x+dy+3=0 are perpendicular to each other. Find the value of the constant.
1 answer