1. Equation of a line y = m x + b
Lesson 10
Equation of a line
y = m x + b

2. Draw horizontal side of triangle Draw vertical side of triangle
Graph point (-3,2)
Draw line
(-3,2)
Draw horizontal side of triangle
Draw vertical side of triangle
(4,-3)
Graph point 4,-3)

3. y is changing from 2 to -3 Change in y = (-3) – (2) Change in y = -5
(-3,2)
Y = 2
y is changing from 2 to -3
Change in y = (-3) – (2)
Change in y = -5
Y = 1
Y = 0
Y = -1
Y = -2
(4,-3)
Y = -3

4. x is changing from -3 to 4 Change in x = (4) – (-3) Change in x = 7
(-3,2)
(4,-3)
x = -3
x = -2
x = -1
x = 0
x = 1
x = 2
x = 3
x = 4

5. Change in y = -5 Change in x = 7
(-3,2)
Change in
y = -5
(4,-3)
Change in x = 7

6. Change in y = -5 Change in x = 7
Slope-intercept form of a line.
(-3,2)
Change in
y = -5
(4,-3)
Change in x = 7

7. Slope-intercept form of a line.
(4,-3)
Change in
y = -5
Change in x = 7
(-3,2)
b is the y-intercept
It appears to be 0. Is it?