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# 4.4 notes

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### 4.4 notes

1. 1. 4.4 Objective: Find the slope of a line and interpret slope as rate of change.
2. 2. Slope of a line
3. 3. Find the slope • Rise = 5 • Run = 3 • Slope = 5/3 • Slope is positive since both rise and run are positive. • Positive slope climbs from left to right.
4. 4. Find the slope • Rise – 1 • Run – -2 • Slope = 1/-2 • Slope is negative since rise is positive and run is negative. • Negative slope climbs from right to left.
5. 5. Zero Slope • Horizontal lines have zero slope • 0 rise/run
6. 6. Undefined slope • Vertical lines have undefined slope • Rise/0 run
7. 7. Slope formula • Change in y (rise) over change in x (run)
8. 8. Practice
9. 9. Rate of Change