Question

How do I do this equation?

Answer 1

if the equation is of the form y=mx+b then b is the y intercept, ie 3

Answer 2

A

Answer 3

y intercept is 2 1/2

Answer 4

I don't really understand how to get the equation..

Answer 5

and the gradient is negative ( slopping down across x

Answer 6

If you notice, there are two points that are marked on the graph. One is (-1,3) the other is (5,0). Use those two points to find the slope.

Answer 7

Can you do that?

Answer 8

Yea, so that means it's -3/6?

Answer 9

Yes. Reduce that to -1/2

Answer 10

Now use point-slope form and plug in the slope and one of the points to find the equation.

Answer 11

Can you do that?

Answer 12

Based on the answer choices, you might want to use the point (-1,3)

Answer 13

I don't really understand this last part, do I put it in one of the equations on the screen or a whole seperate one?

Answer 14

Here is point-slope form:

Answer 15

y = mx + b right?

Answer 16

\[y-y _{1}=m(x-x _{1)}\]

Answer 17

oh

Answer 18

replace m with -1/2 which is the slope. Replace x1 with -1 and y1 with 3 because you are using the point (-1,3)

Answer 19

so y - 3 = -1/2(x + 1)?

Answer 20

Exactly. Isn't that one of the choices?

Answer 21

Yea! It's A! Thanks Mertsj! Wish I could give you more than one medal.. :/

Answer 22

Thank you. Glad to help. Now do a couple more problems like this so you really learn it!

Answer 23

Thanks again :)

Answer 24

yw