Slope-Intercept Form: y=mx+b
Point-Slope Form: Y-Y1=M(X-X1)
You use slope intercept form when you are given the slope and the y-intercept
You use point slope form when you are given the slope and a point
If you have two points on a coordinate plane, than it is easy to find the slope.
To find slope you take the two points: (X1,Y1) (X2,Y2) and simply do the slope formula:
Here is one of the problems we did today as a class with these formulas and parallel lines. (note- parallel lines will always have the same slope and perpendicular lines will always have opposite slopes.)
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