| slope | the ratio of change in the vertical to the change in horizontal |
| direct variation | a relationship as the independent value increases, the dependent value increases, or as the independent value decreases, the dependent value decreases |
| slope intercept form | given the slope m and the y-intercept of a line, the _______ of an equation is y=mx+b |
| point slope form | for a given point (x,y), on a nonvertical line having slope m, the __________ of a linear equation is: y-y1=m(x-x1) |
| parallel lines | if two non-vertical lines have the same slope, then they are _____ |