Algebra 1 4.6 slideshow

1. Warm-up
Use a graph to identify the slope and
y-intercept of each equation.
1. y = -6x
2. y = 3x - 7
3. 4x - y = 5
4. 7x - 3y = 4

2. Slope-Intercept Form
4.6
p. 241

3. y = mx + b
 A linear equation y = mx + b is written in
slope-intercept form.

4. y = mx + b
 A linear equation y = mx + b is written in
slope-intercept form.
 The slope is m -- whatever number is in
front of x.

5. y = mx + b
 A linear equation y = mx + b is written in
slope-intercept form.
 The slope is m -- whatever number is in
front of x.
 The y-intercept is b -- what you would get if
you plugged in x=0.

6. Slope-Intercept Form
 To use slope-intercept form, you must
write the equation by solving for y.

7. Graphing
1. Write the equation in slope-intercept
form.

8. Graphing
1. Write the equation in slope-intercept
form.
2. Plot the y-intercept.

9. Graphing
1. Write the equation in slope-intercept
form.
2. Plot the y-intercept.
3. Use the slope to plot a second point.

10. Graphing
1. Write the equation in slope-intercept
form.
2. Plot the y-intercept.
3. Use the slope to plot a second point.
4. Draw a line through the points.

11. Parallel lines
 Two different lines are parallel if they do
not intersect.

12. Parallel lines
 Two different lines are parallel if they do
not intersect.
 Two lines are parallel if they have the
same slope but different y-intercepts.