Equation of lines
Writing Linear Equations The slope of a nonvertical line is m = 
Given the slope and the y - intercept of a line, the slope and a point on a line, or two points on a line, you can use the slope - intercept form to write an equation of the line.
Example: Write an equation of a line that has a slope of  and passes through the point ( - 4, - 3).
Solution: y = mx + b
- 3 =  ( - 4) + b
- 1 = b |
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So, m =  and b = - 1, and an equation of the line is y =  x - 1. |
