Question

ok i need to find an equation from the to points y=(9,799) x=(4,400) and using the ( y = mx + b)

Answer 1

well you could find the slope m using the rise/run formula:
\[m=\frac{y_1-y_2}{x_1-x_2}\]

Answer 2

then once you have that number the only unknown constant is b
you can use either of your points to find b by plugging in that point into your equation

Answer 3

i have the slope it 5/399

Answer 4

why did you put the x's on top and the y's on bottom?

Answer 5

should be rise over run not run over rise

Answer 6

huh

Answer 7

do you understand the formula is as I have it above?

Answer 8

\[m=\frac{y_1-y_2}{x_1-x_2} \text{ and not } \frac{x_1-x_2}{y_1-y_2}\]

Answer 9

not really

Answer 10

oh ok now i see

Answer 11

so you see it should be the y's on top and the x's on bottom?

Answer 12

well anyways... you have your corrected value for m now and you should be able to plug it in
\[y=mx+b \implies y-mx=b\]
enter in either of the points given and your value for m to find b

Answer 13

but i have m and b i just need an show how i got them

Answer 14

oh you already done the problem?

Answer 15

yes but i forgot how i did it

Answer 16

well you got the wrong slope earlier so I don't think you have the right b unless you redid the problem just now

Answer 17

and I don't see how you could forget that if you just redid it now ...

Answer 18

but anyways you can find b using what I said above

Answer 19

ok thank you

Answer 20

did you want to show me what you have after pluggin in the values I asked you to into
b=y-mx ?

Answer 21

you are given two points
just use one of the points given plug it into b=y-mx along with your corrected value for m
and you will have the value for b