Question

Help me on this algebra question? :) Perpendicular lines
Select the equation of a line that is perpendicular to the line on the graph and passes through the point (-1, 2).
A. y= 2x + 4
B. y= -2x + 2
C. y= -1/2x + 2
D. y= 2x - 1
I'll attach the graph

Answer 1

do you know what the equation of the line is?

Answer 2

also welcome to openstudy!

Answer 3

I do not & thank you :)

Answer 4

ok what number is the line on on the Y axis?

Answer 5

the vertical line is the Y axis

Answer 6

The line's on -1 for the y-axis?

Answer 7

yep and so we have y=mx-1 now what is the line on on the X axis?

Answer 8

-2

Answer 9

Is it that one equation, y-y1 = m(x-x1) ?

Answer 10

wait we've done something wrong the slope is rise/run so -1 is right do u know how to find the slop?

Answer 11

slope

Answer 12

line increasing so that mean positive slope
line decreasing then you should have negative slope

Answer 13

i don't think I remember too much. I havent done this since last year

Answer 14

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Answer 15

rise is 1, would the run be 2 or -2? that confuses me a little bit since it's going to the left lol

Answer 16

left = neg so -2 i need to go @Nnesha please finish :*

Answer 17

\(\color{blue}{\text{Originally Posted by}}\) @spanish356547
rise is 1, would the run be 2 or -2? that confuses me a little bit since it's going to the left lol
\(\color{blue}{\text{End of Quote}}\)
yes right rise is one and run is 2
so rise /run
line is decreasing right so that's why slope should be negative
-rise/run so slope is ?

Answer 18

okay so perpendicular slope should be negative reciprocals
so you need to change sign of graph slope and flip it upside down and then
find b like we did bofre on a previous post :)

Answer 19

before*