Algebra Part 3
Unit 3
Name____________________________
Date________________
Warm-up:
1. Is (2, -3) a solution to 4x + 3y = 1 ?
Graph each equation.
2. y + 3x = 1 (First solve for y!!)
x
-1
3.)
x = -4
4.)
y=3
y
0
1
2
Guided Notes
Graphing Using Intercepts
x-intercept: The x-intercept of a line is where the line crosses the x-axis.
To find the x-intercept of the graph of a linear equation, find the value of x when
___________.
y-intercept: The y-intercept of a line is where the line crosses the y-axis.
To find the y-intercept of the graph of a linear equation, find the value of y when
___________.
Example:
Find the x-intercept and y-intercept of the graph of
x-intercept: Plug in _________
2x + 4y = 8.
y-intercept: Plug in __________
Practice
Find the x-intercept and y-intercept of the graph of each equation.
1. 3x + 2y = 6
2. 5x – 2y = 10
3. -3x + 5y = -15
4. 3x – 4y = 12
Example:
Graph the equation x + 2y = 4 by finding the intercepts and
then connecting the two points.
Practice
Graph the equation by finding the intercepts.
5.)
4x + 8y = 24
Homework: pgs. 271-272 #5, 7, 8, 11, 12, 13
6.) 3x – 3y = -9