Question

Choose the equation of the line passing through the point (-1, -2) and perpendicular to y = 1/4x + 2.

y = 4x - 6

y = -4x - 6

y = -4x + 2

y = 4x

Answer 1

For two lines to be perpendicular, the product of their slopes must equal -1. The known line is in the slope-intercept form: \(y = mx + b\) where \(m\) is the slope and \(b\) is the y-value of the y-intercept. Use the slope to find the slope of the perpendicular line. Then use the known point to find the value of \(b\) for the perpendicular line.

Answer 2

@whpalmer4 so would the answer be a? :P

Answer 3

Well, what's the slope of the known line, and what's the slope of the line in a)? If you multiply them together, what do you get?

Answer 4

wait a sec I got this wrong >.> can u help me out? :(

Answer 5

That's why I'm here :-)

Answer 6

XD so how do I start? :) this is a pretest, so I dont really know how to solve it or anything D:

Answer 7

Okay, look at my first post, where I describe the slope-intercept form. Now look at the equation in the question, and compare them. What is the coefficient of x in the equation? That will be the slope of the line.

Answer 8

(the original line, that is)