1. Slope The slope of a linear equation is the same everywhere along the line. We know how to use slope-intercept form: In slope-intercept form, the slope is m. If all we know is two points on the line, we can find the slope. Points: Slope:

2. Point-Slope Form There’s another form for linear equations that we can use if we know the slope and one point on the line. It’s called point-slope form. Slope: Point: Point-Slope Form:

3. Point-Slope Form Let’s practice writing equations in point-slope form. When given the slope and a point, all we have to do is plug them into the formula. Slope: -2 Point: (-4, 3) Equation:

4. Point-Slope Form Slope: 1/2 Point: (10, -3) Equation:

5. Point-Slope Form Slope: 1 Point: (-5, -7) Equation:

6. Point-Slope Form What if we only know two points on the line? Can we write an equation in point-slope form? Calculate the slope using. Then, plug one of the points and the slope to the formula. Let’s try it! Points: (1, 3) and (3, 7) Slope: 2 Equation:

7. Point-Slope Form Points: (-4, 2) and (0, 4) Slope: ½ Equation:

8. Homework #83-94