Question

find the equation of the line passing through (0,-1),(1,3). Enter the equation as y=mx+b.

Answer 1

f(x)=4x-1

Answer 2

Steps should be explained, not just answers given

Answer 3

are u sure? I put y=4x-1 into graph and it doesn't pass thru those points? because thats what i got too

Answer 4

@Kathi26

Answer 5

@Hero is that the answer? i got y=4x-1

Answer 6

Let me see

Answer 7

ok. after, can u help me with a few more? then thats it? since I see you're smart:)

Answer 8

You probably won't understand those steps

Answer 9

There's more than one way to do these

Answer 10

So it is not what the other person said, its y=2x-1?

Answer 11

Hang on a sec

Answer 12

but the slope is 4..

Answer 13

I know, I goofed up, that's why I said hang on a sec

Answer 14

(x,y) = (0,-1)

y = mx + b
-1 = m(0) +b

-1 = b

(x,y) = (1,3)

y = mx + b

3 = m(1) - 1
3+1 = m
4 = m

y = 4x - 1

Answer 15

So that's the steps and 4 is the slope

Answer 16

Ok can u hlp with a few more! thanks so muuhc:
which of these points lie on the line that passes through (6,2) with slope m=2/3? Select all answers that are correct. A) 3,0 B) (-4,0) C) (3,-2) D) (-3,-4)

Answer 17

You have to use the point slope formula

\((y - y_1) = m(x - x_1)\)

Answer 18

ok

Answer 19

for the first ordered pair, i got y-0=2/3(x-0)

Answer 20

The first ordered pair is not (0,0)

Answer 21

im not sure how to check if the ordered pairs work

Answer 22

and i meant x-3

Answer 23

Well, you're supposed to use the point-slope formula to get the form y = mx+b

Answer 24

But you don't really have to do it that way

Answer 25

You can just continue using y = mx + b and substituting values to find m and b

Answer 26

Can u do that? i tried and can't get it

Answer 27

Basically, they give you one of the points (6,2) so we know

y = mx + b becomes:
2 = 2/3(6) + b

Answer 28

Now just solve for b

Answer 29

Ok so b is -2

Answer 30

Very good

Answer 31

Now you have

y = 2/3(x) - 2

Answer 32

What you need to do now is substitute the other points and see if you get equal numbers on both sides of the equal sign

Answer 33

then plug in ordered pairs. let me do that and tell u what i gott

Answer 34

I got A and D

Answer 35

3,0 and -3,-4

Answer 36

Yup, you got it :D