Question

HELP ME PLEASE i really need help with this ASAP !!!! Select the equation of a line that is perpendicular to the line on the graph and passes through the point (-1, 2).

Answer 1

Firstly, we need to find the slope of the given line. Tell me that if you can please.

Answer 2

i cant . idk how to find slopes on graphs

Answer 3

Alright. In short, slope is equal to rise over run, which is really just how much it goes up over how much it goes right. If one of those is negative, then you simply add a negative. So, how much does a point go down to be on the same y coordinate as the next point?

Answer 4

2 ??

Answer 5

Let's consider the two points (-2,0) & (0,-1). And, let's use the a formula this time to find slope. The formula is \[(y2-y1)/(x2-x1)\]

Answer 6

So, plug in what you know.

Answer 7

-1-0\div2

Answer 8

so -0.5 ?

Answer 9

forget the first answer. typo

Answer 10

Correct, though I'd suggest not making it a decimal, keeping it as a fraction allows us to use whole number to find the next point, should we ever have to. So, keep it as -1/2 for now. NOW, knowing your slope, do you know what point-slope form is?

Answer 11

no..

Answer 12

actually yes. its y-y=m(x-x1)

Answer 13

Excellent! Knowing that, please plug in the values you know.

Answer 14

for this question?

Answer 15

Yep.

Answer 16

y-0=-1/2(x+-2)

Answer 17

i solve it ?

Answer 18

Wait, one moment. You input the incorrect point. Looking at the instructions, what point does it say to use?

Answer 19

y-y1=m(x-x1)

Answer 20

No, what ordered pair did I say to use?

Answer 21

*does it say to use

Answer 22

-1,2

Answer 23

Yeah, so use that instead.

Answer 24

y-2=m(x-(-1)

Answer 25

Don't forget the ending parenthesis, but I forgot one thing: It's a line perpendicular to the given slope. So, flip the slope, making the denominator the numerator and visa versa, and make it negative.

Answer 26

so y-(-1)=m(x-2)

Answer 27

No, don't change your ordered pair at all. Just the slope.

Answer 28

my slope is 1/2 right ?

Answer 29

Almost. It's negative.

Answer 30

y-2=-2/1(x-(-1)

Answer 31

You're really close, but you forgot this: if I have a negative number, and I apply another negative to it, what does it become?

Answer 32

positive ? so x+1?

Answer 33

True, but I'm talking about the slope.

Answer 34

i dont get what i have to change about the slope.

Answer 35

positive 1/2 ?

Answer 36

Don't forget to flip the fraction. So, final form?

Answer 37

2/1 !

Answer 38

would it be y = - 1 over 2 x + 2 ?

Answer 39

No... That has nothing to do with this...

Answer 40

oh cause thats one of my options and it seems logical

Answer 41

Just give me the final form in point-slope form please.

Answer 42

y-2=2/1(x+1)

Answer 43

Correct. Now, I must go, but that could be your answer, or you may have to isolate y by distributing the 2, and adding the two from the left side. Ok?

Answer 44

thank you !

Answer 45

Welcome!