Question

I WILL FAN AND GIVE YOU A MEDAL!! The equation of line AB is y=1/5x -1. Write an equation of a line perpendicular to line AB in slope intercept form that contains point (1,-2).

Answer 1

Remember that a perpendicular line to AB will have a slope "m" that is the negative reciprocal of the line AB. The negative reciprocal of 1/5 x would be -5x. Proceed from their using the required point (1,-2)

Answer 2

@TheSmartOne do you know this

Answer 3

Yes (:

Answer 4

First we need to find the slope of the perpendicular line.

If the slope of the line is a/b, then the slope of the perpendicular line is -b/a

So what is the slope of the perpendicular line of the slope is 1/5?

Answer 5

-5x?

Answer 6

just remember the slope is the number without the x :P

correct, so now we have so far

y = 5x + b

now we need to find b which is the y-intercept

they gave us a point, plug that in

(1, -2)

It's in the form (x, y) so plug in x = 1 and y = -2 and solve for b :)

Answer 7

-7= b

Answer 8

correct, so the final equation is

y = -5x - 7

Answer 9

THANK YOU SO MUCH

Answer 10

It was my pleasure! And also, welcome to OpenStudy! :D