Question

http://prntscr.com/5q5v0f

Step by step, don't give me the answer!

Answer 1

@perl @poopsiedoodle

Answer 2

pick two points and calculate slope using slope formula

Answer 3

pick two points on the line *

Answer 4

I want to learn how to solve problems like this

Points 2, -2

Answer 5

we need ordered pair points

Answer 6

@perl can you delete @taylor_152d's comments?

Answer 7

points (x,y)

Answer 8

ok

Answer 9

Okay, (-2, 2)

Answer 10

there

Answer 11

be careful

Answer 12

(-2,2) is not a point on the line

Answer 13

(2,2)

Answer 14

right :)

Answer 15

can you pick another point

Answer 16

(2,2) (-2,2)? (2,-2)?

Answer 17

(2,2) and (2, -2) are two points

Answer 18

The x value for every point on the line "x=2" is 2.
But the point (-2,2) is on the line x = -2 , which is a different line

Answer 19

you can click points on the graph of this line
https://www.desmos.com/calculator/bccc3s5kvu

Answer 20

Oh okay

Answer 21

ok now lets compute slope with points
(2,2) and (2,-2)

m = (y2 - y1 ) / (x2 - x1 )

Answer 22

So, I fill my point in with that?

Answer 23

Do I multiply?

Answer 24

You know that the slope is defined as the rise over run, right? Also points are typically expressed as (x-coordinate, y-coordinate)

Answer 25

Ohh okay, so how is that rise divided by the run?

Answer 26

You use what perl wrote "m = (y2 - y1 ) / (x2 - x1 ) ", which literally means "slope = rise / run"

Answer 27

You use the two points y-coordinates difference and divide by the x-coordinates difference.

Answer 28

You will get m = (2-2) / (2-2), which gets problematic.

Answer 29

Vertical lines are special, since with this formula you get 0 in the denominator, which is undefined. A vertical line (goes straight up or down) has no slope, or even an infinite slope.

Answer 30

Oh okay thanks

Answer 31

m = (y2 - y1 ) / (x2 - x1 ) is what you would use when you have a slope though.

Answer 32

if you plug in the values into the slope formula you get division by zero , which is undefined