Posted by trixie on Thursday, September 3, 2009 at 4:53pm.
find the yintercept 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:
(yy1)=m(xx1)
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 yintercept 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:
yintercept = y1mx1
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