1. Review
Plot (3,5) (-4,3) (0,4) (-2,0)
Identify the coordinate.

2. 4.2 Graphing Linear Equations

3. NOTES
Solution of equation: 2 variables (x and y) is an ordered pr. that makes equation true.
Ex: x + 3y = 6
Solution: (-3,3)
Graph of an equation: x and y is the set of all points that are solutions to an equation.
Ex: y = 2x + 2

4. Questions – t decide which 2 points lie on the graph of the line
2x + 4y = 8 A. (2,1) B. (1,2)
3x – y = 8 A. (2,2) B. (3,1)

5. Questions – t decide which 2 points lie on the graph of the line
Y = 4x - 2
(-1,-6) B. (0,2)
Y = 1/2x + 3
A. (-2,4) B. (0,3)
Y = 4
(4,2) B. (2,4)
X = -3
A. (-3,2) B.(3,-3)

6. Find three ordered pairs that are solutions to the equations – t/st.
Y = 2x + 1
Y = 5 – 2x
X = 4
Y = 3(2x + 4)
Y = -1/2x - 4

7. Function form Function form: solve for y. Ex: 3x + y = 7 2x – 3y = 3

8. Function Form
Y – x = 1
3x – 5y = -1
2x + 3y = 12
-5x + 2y = -4

9. Graphing linear equations
Graph y = 2x
Graph y = -x + 3

10. Graph Linear Equation-st
Y = 3x – 4
Y = 1/2x + 1
Y = 2x - 3

11. Horizontal/Vertical lines
Horizontal: line crosses y- axis.
Vertical: line crosses x- axis
Ex: x = 3, x = -2
y = 2, y = -5

12. Vertical/Horizontal Graphs-st
Graph the following
X = 2
Y = -4
X = -1

13. Word Problem - C
You earn $15 an hour mowing a lawn and $10 an hour washing windows. You want to make $400 in one week.
Write an algebraic equation.
Solve equation for y
Sketch a graph of equation
If you spent 14hrs mowing, how many hours do you have to wash windows to earn $400?

14. Wrap up
Questions/Comments
Hw: Text pg. 214, #’s: evens