Question

Please Please someone help. Last question to a 5 part assignment I've been trying to finish.

Below is a graph that represents the total profits for a third month. Write the equation of the line that represents this graph. Show your work or explain how you determined the equations.

Graph of line going through ordered pairs (0, 300) and (450, 0)

Answer 1

Find the slope by using rise over run then use point slope form

Answer 2

How do I do that?

Answer 3

@Shalante

Answer 4

since x is higher on the 450
x2 becomes 450
x1 becomes 0
y2 become 300
y1 become 0
Slope is rise over run
m=y2-y1/x2-x1 where m is the slope
After you find slope, tell me

Answer 5

300/450

Answer 6

@Shalante

Answer 7

0-300=-300
So the slope is -300/450
You have to reduce it so its -2/3
m=-2/3
The point slope form is y-y1=m(x-x1) or y-y2=m(x-x2) either one works
then bring the y1 over the right side

Answer 8

which one is y and which one is y1

Answer 9

im confused

Answer 10

(y1) is the value used for the y value you are replacing. So, if you had an example ordered pair of, (5,7), the equation would be [y-7 = m(x-5)], adding the slope to whatever equation you have.

Answer 11

y-0=-2/3(x-450)

Answer 12

So, if you understand rise over run, first find the slope of the two points, then use point slope form to substitute in your x, y, and slope values.

An easy formula for finding slope in a two-dimensional coordinate plane is...

\[\frac{ y2 - y1 }{ x2 - x1 }\]

Answer 13

im still confused

Answer 14

distribute it

Answer 15

what do i do next

Answer 16

how do i do that?

Answer 17

distributing by multiplying the paranthese
for example
6(a-b)
6a-6b

Answer 18

y-0=-2/3x-450

Answer 19

like that^

Answer 20

no you multiply the -2/3 by 450 which equals -300
so its y=-(2/3)x+300

Answer 21

ok and then what do i do?

Answer 22

thankyou by the way for helping me

Answer 23

That is the equation. You are done.

Answer 24

wow that wasnt that hard. so in the future all i do is find the slope, then do that other formula and then distribute?