Question

Which of the following is the equation of a line that passes through (-2, -1) and (-4, -3)?

Answer 1

What two things do you need in order to find the equation of a line?

Answer 2

x and y ?

Answer 3

no you need a point and a slope.
You are given two points so you can pick either.

All you have to do now is find the slope and plug that into this equation
\[y-y_a=m(x-x_a)\]
where\[m=slope \\ (x_a,y_a)= point \]

Answer 4

Alright do you know how to find a slope between two points?

Answer 5

I dont remember ..

Answer 6

\[m=\frac{(y_a-y_b)}{(x_a-x_b)}\]
where
\[(x_a,y_a)\]\[(x_b,y_b)\]
are the the two points given to you. You think you can find the slope now?

Answer 7

slope is -1

Answer 8

@russellp i dont think that's right....can you show your work

Answer 9

(-2 ,-1 ) (-4 , -3) y2 -y1 / x2 -x1 = slope
-4 - -1 / -3 - -1 = 5/4 = 1.25 corrected sorry
Does that calculation seem correct?

Answer 10

you mixed the y and x together as well as subtracting wrong

Answer 11

-3 - -1/ -4 - -2 = -2 / -2 = 1 slope ? Try this one ????
Thank you

Answer 12

The answer is 1 ?

Answer 13

How do i make that into an equation then ?

Answer 14

the equation for the line is y=mx + B where m is the slope of the line and b is the y intercept therefore calculate from there

Answer 15

Thank you