1. Linear Functions Slope and y = mx + b

2. Remember Slope… Slope is represented by m m = 0 Horizontal Line Vertical Line Slope up to the right Slope up to the left m = undefined m = positive m = negative

3. Determining Slope To calculate slope we used the formula: or

4. Example Example 1: Find the slope of the line that passes through each of the following pairs of points. a) (5, -3) and (-7, 1) b) (-3, -2) and (5, -2) c) (-6, 10) and (-6, -5) Solution to a): Solution to b): Solution to c):

5. Remember… Slopes of parallel lines are the same Slopes of perpendicular lines are negative reciprocals of one another Example: y = 3x + 5  remember y = mx + b Parallel line – slope of 3 Perpendicular line – slope of –1 3