Question

Select the pair of equations whose graphs are perpendicular.

2x - 8y = 9
12x - 3y = 7

3x + 6y = 8
y = 2x - 8

y = 2x - 7
x + y = 3

2y =- 3x + 5
2x + 3y = 4

Answer 1

I hear it's really cool when you solve for \(y\).

Answer 2

the product of slopes of perpendicular lines is -1

3x + 6y = 8 ----> m=-3/6=-1/2
y = 2x - 8 -----> m'=2
m*m' = -1

3x + 6y = 8 and y = 2x - 8 are perpendicular