Question

Write the equation of the given line in slope-intercept form.
Coordinates are (-1, 2) & (1, -4)

A. y= 3x - 1
B. y = -3x - 1 <----
C. y = -3x + 1
D. y = -1/3 x - 1

THE ANSWER IS B

Answer 1

Hi welcome to openstudy :)
Start by finding the slope
\[\LARGE \frac{y_2-y_1}{x_2-x_1}=slope\]
\[\LARGE \frac{-4-2}{1--1 }=slope\]
\[\LARGE \frac{-4-2}{1+1 }=slope\]

Find the slope

Answer 2

y=mx+b

m= slope

Answer 3

ok give me a sec

Answer 4

slope is y over x (y/x)

Answer 5

is it -6/2?

Answer 6

pooja's formula for the slope is the more relevant one here.

Answer 7

Vicky: I'd be happy to give you feedback if yo u show your work.

Answer 8

Yes what is -6 divided by 2?
we can always simplify the slope

Answer 9

^If it's possible to

Answer 10

well i just finished your equation...i got 3/ 1?

Answer 11

-

Answer 12

You've reduced the fraction representing the slope, but you have not "finished your equation."

Answer 13

When we divide by ONE negative our solution will include a - so 3 is correct but it would be -3

Answer 14

oooh ok i see

Answer 15

the desired equation is y=mx+b. Supposedly you've found the slope, m.

Answer 16

^use that

y=-3x+b

Answer 17

Here pooja has substituted -3 for the slope, m.

Answer 18

How would you now find the value of the y-intercept, b? Hint: you started out with two points.

Answer 19

yeah, it's not c

Answer 20

basically...you now have the equation
y=-3x+b

Answer 21

b = y-intercept

or when x=0

Answer 22

A simple way of solving a problem like this, if you were given multi choices is to just plug in the the x and y cords into the equation and see if it works out

Answer 23

Im still lost

Answer 24

Wait nevermind i think i got it lol sorry

Answer 25

Do you want to know the simple way of solving the problem or do you want to know how to construct the equation from the 2 sets of points

Answer 26

Its A right?

Answer 27

nop

Answer 28

b sorry

Answer 29

yep

Answer 30

Sorry it took me so long to figure it out! I really appreciate your patience :)