Question

Line EF has an equation of a line y = −2x + 7. Which of the following could be an equation for a line that is perpendicular to line EF?

y = 2x − 3
y = 1 over 2x − 3
y = −2x − 3
y = −1 over 2x − 3

Answer 1

slope should be negative reciprocal

Answer 2

it's either B or D

Answer 3

so negative of -2 = -(-2) = 2
reciprocal
1/2

Answer 4

I don't understand where they get the 3 from

Answer 5

3 is the y-intercept

Answer 6

if line AB is perpendicular to line CD then the slope of AB* slope of CD = -1

Answer 7

slope of given line is -2