1. 5.4 Writing Equations in Point-Slope Form

2. y = mx + b Ax + By = C y – y1 = m (x - x1) x2 – x1 Forms of lines
Slope-intercept form: “y by itself” Standard form: “x and y alone on the left” Point-slope form:
Ax + By = C
y – y1 = m (x - x1)
Slope Formula y2 – y1
x2 – x1

3. y - y1 = m (x - x1) These do not change
Ex. 1: Find an equation in point-slope form for the line passing through (2,4) with slope .
These do not change
y - y1 = m (x - x1)

4. Ex 2 Write the point-slope form of an
Ex 2 Write the point-slope form of an equation for a line that passes through (-2,0) with slope
y - y1 = m (x - x1)

5. Ex 3 Write the equation of a line in point-slope form that contains the given points.
First find the slope
Then pick a point (it doesn’t matter which on you choose)

6. Ex 4 Write the equation of a line in point-slope form that contains the given points.
First find the slope
Then pick a point (it doesn’t matter which on you choose)

7. Ex 5 Write the equation of a line in point-slope form that contains the given points.
First find the slope
Then pick a point (it doesn’t matter which on you choose)

8. Example 6
Graph the equation.

9. Example 7
Graph the equation.

10. Example 8

11. Homework
WB Pg 151 #1-14