Question

Write an equation of a line that is perpendicular to y = 6x -9 and has a y-intercept of 3.

Answer 1

You can find the gradient of perpendicular line using the formula M1m2=-1

Answer 2

no i dont get this stuff

Answer 3

Okay the general equation of a line is y=mx+c
where m is your gradient/slope
and c is your y-intercept

Answer 4

ok

Answer 5

Okay so for you to find the perpendicular line, u need to find y=mx+c
Do you know your C?

Answer 6

3?

Answer 7

Good, so now u just have to find your m.
There is a formula that says that the gradient of the first equation X gradient of perpendicular equation = -1
Hence M1M2=-1
From there find M2

Answer 8

i am not sure i under stand your last reply?

Answer 9

what do i do?

Answer 10

Okay so basically need to find the gradient of the perpendicular line.

Answer 11

y=mx+c to y=m(-1)+3??

Answer 12

No, to find the gradient of your perpendicular line :
Gradient of original line X Gradient of perpendicular line =-1
M1*m2 =-1
6*m2 =-1
m2 = -1/6

Answer 13

Ok

Answer 14

Do you understand?

Answer 15

yes

Answer 16

:D

Answer 17

:) Thank you!