Question

Find the equation of the perpendicular line to each of the following that passes through the point indicated 4x + 5y = - 40 passing through the point (-1, 3)

Answer 1

that isn't one of my answer choices

Answer 2

To do this sort of question, I'd first get the answer in terms of y=mx+c. Then m is your gradient and to get the perpendicular gradient it is -1/m. Then you need to get the y-intercept right so that it goes through that point! To do this, replace x with -1 in your y=mx equation then you should be able to work out what c has to be so that in that instance, y is 3! Does that make sense?

Answer 3

y=5/4x+17/5

Answer 4

not really

Answer 5

*17/4

Answer 6

5x-4y = -17

Answer 7

There you go.

Answer 8

-4/5 x - 8

Answer 9

Ok, so you can rewrite that equation as
y=−4/5x−8
agreed?