Question

Find the equation (in terms of x) of the line through the points (-1,-1) and (4,2)

Answer 1

@ageta

Answer 2

i will be right back

Answer 3

m =(y2-y2)/(x2-x1)
let P1(-1,-1) & P2(4,2).

Answer 4

Would this need to be in slope-intercept or point-slope form?

Answer 5

no

Answer 6

As @ageta showed we would first find the slope of the two points....

\(\huge{\frac{y_{2}-y_{1}}{x_{2}-x_{1}}}=slope\)

So we input the first and second points....

\(\huge{\frac{2-(-1)}{4-(-1)}}=slope\)

Answer 7

thats all the question says, i have no idea

Answer 8

@563blackghost help him im busy

Answer 9

no that is not correct we are not using slope formula

Answer 10

the slope is 3/5

Answer 11

bye guys

Answer 12

From what I saw you had used the slope fomula to find the slope @ageta

Answer 13

Correct :)

So we now know the slope....since we are given the first two points and not knowing the y-intercept lets set this in point-slope form....

\(\huge{y-y_{1}=m(x-x_{1})}\)

m is the slope....x1 and y1 is the first point which would be `(-1,-1)`....Input these ;)

Answer 14

I did that already and tried submitting as y=mx+b , its wrong

Answer 15

So you submitted in slope-intercept form?

Answer 16

yes

Answer 17

If its not slope-intercept then it would be point-slope form which is what I had shown above.

Answer 18

Okay, let me try

Answer 19

where you're supposed to put the answer it has y= and then a place for u to put the answer

Answer 20

so like y=_________
so no way to put point slope

Answer 21

Then it would be in slope-intercept form....what was the answer you got before?

Answer 22

with the points (-1,-1)(5,-4)

y=-1/3x+2/3

Answer 23

the points change everytime i try an answer

Answer 24

We know of the slope which is \(\Large{\frac{3}{5}}\).....but we need to place in slope-intercept form so we need to find the y-intercept....So lets input the slope into the format...

\(\huge{y=\frac{3}{5}x+b}\)

Now we need to find b...in order to do that we would input one point where x and y is....lets use `(-1,-1)`.....

\(\huge{-1=\frac{3}{5}(-1)+b}\) Simplify....

What would b equal?

Answer 25

2/5=b

Answer 26

Close. It would actually be negative instead of a positive. So now we know of the slope and y-intercept so we input it into the slope-intercept format....

\(\huge{y=\frac{3}{5}x-\frac{2}{5}}\)

This is the equation.

Answer 27

okay let me try haha

Answer 28

Was it successful?

Answer 29

Nope... ://

Answer 30

hmmmm how did you type it?

Answer 31

OMGGG IT WORKED WITH ANOTHER POINT!!! THANK YOU THANK YOU!!!!!

Answer 32

You welcome! :D Glad it worked!

Answer 33

:D