1. Review of Slope
LESSON 10

2. HOW TO FIND SLOPE? 1. Use the formula and count the spaces on a graph.
There are three ways in which we can solve for slope:
1. Use the formula and count the spaces on a graph.
RISE
RUN
Slope = 2 3 =

3. HOW TO FIND SLOPE?
There are three ways in which we can solve for slope:
2. Use the formula when you are giving two points on a line.
y2 - y1
x2 - x1
Slope =
[ 3 - (-1)]
[ 1 - (-5)] = 4 6 = 2 3 =

4. HOW TO FIND SLOPE?
There are three ways in which we can solve for slope:
3. Use the equation of the line to determine the slope. 2 3 7 3
y = x +
Slope 2 3 =

5. HOW TO FIND EQUATION OF A LINE?
1. You are given the slope and the y-intercept.
EXAMPLE:
m = -2, b = 3
Use the slope y-intercept form of the equation of a line.
SOLUTION:
y = -2x + 3
y = mx + b

6. HOW TO FIND EQUATION OF A LINE?
SOLUTION:
2. You are given the slope and one point on the line.
Step 1:
Find the slope
Step 2:
Find the y-intercept
Step 3:
Write the equation
EXAMPLE:
m = -2, A(-1,3)
Step 1: You have the slope: m = -2
Step 2: Find the y -intercept
y = mx + b
(3) = (-2)(-1) + b
3 = 2 + b
3 - 2 = b
1 = b
Step 3: Find Equation
y = mx + b
y = -2x + 1

7. HOW TO FIND EQUATION OF A LINE?
SOLUTION:
3. You are given two points on a line.
EXAMPLE:
R(1,4), S(4,-2)
Step 1:
Find the slope
Step 2:
Find the y-intercept
Step 3:
Write the equation
y2 - y1
x2 - x1
Slope RS =
(-2 - 4)
(4 - 1) = -6 3 =
= -2
Continued next slide

8. HOW TO FIND EQUATION OF A LINE?
SOLUTION:
3. You are given two points on a line.
EXAMPLE:
R(1,4), S(4,-2)
Step 1:
Find the slope
Step 2:
Find the y-intercept
Step 3:
Write the equation
Find y -intercept
y = mx + b
(4) =(-2)(1) + b
4= -2 + b
4 + 2 = b
6 = b
Step 3: Find the equation
y = mx + b
y = -2x +6

9. CLASS WORK Finish Lesson 9(5) worksheet Check solutions to Lesson 9(5)
Copy notes from this lesson.
Do Lesson 10 worksheet