Posted by **trixie** on Thursday, September 3, 2009 at 4:53pm.

find the y-intercept of a line that passes through (2,1) and has a slope of -5.

i forgot what equation i have to use to find this out. can someone give me which equation i have to use?

or all the equations that deal with slopes please

- algebra review -
**MathMate**, Thursday, September 3, 2009 at 5:01pm
A line of slope m passing through the point P1(x1,y1) has the equation:

(y-y1)=m(x-x1)

Post your answer if you need a check.

But you can check your own answer by substituting (x1,y1) in the equation to see if the two sides balance.

- algebra review -
**MathMate**, Thursday, September 3, 2009 at 5:03pm
Oh yes, the y-intercept can be found by setting x=0 in the resulting equation of the line.

If you simplify the equation of the line using x=0, you should get:

y-intercept = y1-mx1

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