Question

The following linear functions are perpendicular lines. 3y=9x-12 and -x-3y=-21

Answer 1

true or FALSE?

Answer 2

What is the slope of 3y=9x-12?

Answer 3

9?

Answer 4

im guessing...

Answer 5

It needs to say y= something. Then the coefficient of x will be the slope. So divide both sides by 3 to get it into the y = mx+b form

Answer 6

What did you get?

Answer 7

Slope of 3y=9x-12 is 3
Slope of -x-3y=-21 is -1/3, when multiplying 3 and -1/3 we get -1 which is a characteristic of perpendicular lines.

Answer 8

OHHHHHHHHHHHHHHH, :) soo it's TRUE..

Answer 9

So yes;. Lots of people could have told you that it is true. And now you still don't know how to do the problem yourself.

Answer 10

yea i do, u just explained it 2 me

Answer 11

Understanding what someone else did and doing it yourself are two completely different things.