1. Interpreting Slope and Y-Intercept
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Cain 11/20/08

2. The value of y where the line crosses the y-axis
REVIEW!
Slope is :
RISE
RUN
Coefficient of x
Y-Intercept is :
A constant term
The value of y where the line crosses the y-axis
Slope and y-intercept are both
numbers
y = mx + b

3. What happens to the graph when…
y = x 1.
becomes y = x + 2?
The y-intercept changes from 0 to positive 2.

4. What happens to the graph when…
y = x 2.
becomes y = x ─ 3?
The y-intercept changes from 0 to negative 3.

5. What happens to the graph when…
y = x 3.
becomes y = 3x?
The slope changes from 1 to 3.

6. What happens to the graph when…
y = x 4.
becomes y = ─x?
The slope changes from 1 to -1.

7. What happens to the graph when…
y = x 5.
becomes y = 2x ─ 3?
The y-intercept changes from 0 to negative 3 and the slope changes from 1 to 2.

8. What happens to the graph when…
y = 2 6.
becomes y = ─ 1?
The y-intercept changes from 2 to ─1.

9. What happens to the graph when…
y = x 7.
becomes y = ─x + 1?
The y-intercept changes from 0 to 1 and the slope changes from 1 to ─1.

10. Write an equation with the following traits:8.
A slope of 5 and a y intercept of 0
y = 5x + 0
y = 5x 9.
A slope of 3 and a y intercept of ─2
y = 3x ─ 2

11. Write an equation with the following traits:
10.
What kind of line has a slope equal to zero?
A slope of 0 and a y intercept of 4
y = 0●x +4
y = 4
A slope of 0 and a y intercept of ─99
A horizontal line
y = a constant term
11.
y = ─ 99

12. Thank you for your attention!