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)

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- anonymous

- chestercat

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- anonymous

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

- anonymous

How do I do that?

- anonymous

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- anonymous

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

- anonymous

300/450

- anonymous

- anonymous

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

- anonymous

which one is y and which one is y1

- anonymous

im confused

- nerdyotter

(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.

- anonymous

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

- nerdyotter

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

- anonymous

im still confused

- anonymous

distribute it

- anonymous

what do i do next

- anonymous

how do i do that?

- anonymous

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

- anonymous

y-0=-2/3x-450

- anonymous

like that^

- anonymous

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

- anonymous

ok and then what do i do?

- anonymous

thankyou by the way for helping me

- anonymous

That is the equation. You are done.

- anonymous

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

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