Question

What is the slope of a line perpendicular to the line whose equation is y = − 2/7 x − 5?
A. -2/7
B. -7/2
C. 2/7
D. 7/2

Answer 1

Answer is D; 7/2

Answer 2

to find the slope of a perpendicular, you first have to find the slope of the equation of the line given.
y = -2/7x - 5. In y = mx + b form, the slope is in the m position. So the slope of the line given is -2/7. To find a perpendicular slope, you need to get the negative reciprocal of the slope given. All that means is " flip " the slope and change the sign.
So the negative reciprocal of -2/7 is 7/2 (see how I flipped the slope and changed the sign.
Karebear is correct, I just thought I might explain it to you so you can understand.