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April 21, 2014

April 21, 2014

Posted by **Rick** on Sunday, February 19, 2012 at 5:10pm.

Through (2, −3) and (1, 1)

Which formula do I use?

y2-y1/x2-x1 or y-y1=m(x-x1)[<--if i use this how do i plug in the numbers?]

Thank you.

- Algebra -
**MathGuru**, Sunday, February 19, 2012 at 6:35pmUse both formulas.

m = (y2 - y1)/(x2 - x1)

= [1 - (-3)]/(1 - 2)

= (1 + 3)/(1 - 2)

= 4/-1 or -1/4

Substitute the first ordered pair into the second formula:

y - (-3) = -1/4(x - 2)

y + 3 = -1/4x + 2/4

y = -1/4x + 2/4 - 3

y = -1/4x - 10/4

This equation is in the form: y = mx+b

I hope this helps.

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