Question

the equation of line n is 8x - 14y + 3 = 0. What is k if the graphs of n and kx - 7y + 10 = 0 are perpendicular?

Answer 1

If an equation is perpendicular, their slope is a negative reciprocal of each other. For example, if one slope was 1/2, the perpendicular slope would be -2. Hope this helps 

Answer 2

Answer:

The answer is C. -49/4

Proof: