Write the equation of the line perpendicular to y = -3x- 9 and passing through (6,8).

Question

y = 3x + 5

y = -1/3x - 7

y = 3x + 4(wrong)

y = -1/3x + 10

Answer 1

to be perpendicular requires a negative inverse slope. Given -3, the negative inverse is 1/3. None of the answers has 1/3. None are correct.

but if you had to choose one, the last choice at least does have the given point as on the line. all you need is to change the sign of the slope, the coefficient of the x term. Maybe the negative sign was a typo? No, that wouldn't really work, but at least the last choice is closer than the other 3 choices.