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Mathematics 7 Online
OpenStudy (anonymous):

how do i determine the equation of the line

OpenStudy (anonymous):

OpenStudy (anonymous):

Okay, what's the y-intercept of the line (where does the line meet with the y-axis)?

OpenStudy (anonymous):

here is a graph

OpenStudy (anonymous):

Yes, I know. Do you know where the y-intercept is?

OpenStudy (anonymous):

y=5

OpenStudy (anonymous):

what confuses me is the slope

OpenStudy (anonymous):

No, not exactly. It crosses the y-axis at (0, 4)

OpenStudy (anonymous):

Okay, slope = how steep/narrow the line is. So in this case, you have (0, 4) and (1,1) on the line.

OpenStudy (anonymous):

The slope is easy to find when you're given a graph. You use rise over run. If the line gradually decreases (it goes down), then the slope is negative. The slope is negative in this case.

OpenStudy (anonymous):

it goes over 1 and across 3?

OpenStudy (anonymous):

-3/1?

OpenStudy (anonymous):

Yeah, that's right! Good job

OpenStudy (anonymous):

So, now do you know how to write an equation?

OpenStudy (anonymous):

thank you

OpenStudy (anonymous):

np, do u get how to answer the q now?

OpenStudy (anonymous):

-3/1x+4

OpenStudy (anonymous):

right! but you forgot the x with the slope -> y = -3x + 4

OpenStudy (anonymous):

yeah, now it's perfect

OpenStudy (anonymous):

you can just write -3 too, it means the same thing (:

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