Posted by trixie on .
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,
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,
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