1. October 31, 2011 At the end of today, you will be able to: Solve linear equations by graphing. Determine what each system indicates about their solutions. Graph y = 2x – 3 1: Start at___________ 2: (up or down)____steps 3: right______step 4: Plot the point, and continue steps #1-4 to find more points. 5: Draw the line that goes through the points. 6: Label the line. y x 5 5 -5 -3 2 1 y = 2 x – 3 HW 3.1 Pg. 113 #13-27 odd, 64

2. Use a straight edge, graph paper, and two different colored pencils to graph the following: 1.Graph two of the lines on the same graph: y = x – 1 and y = -x – 3 2.Graph:and 3. Graph: y = -2x + 4 and

5. What do the graphs of System of Equations tell you? Intersecting Lines Exactly one solution Parallel Lines No solution Same Line Infinitely many solutions Consistent and independent Consistent and dependent Inconsistent

6. A solution of the system of equations is the ordered pair where the two lines intersect. What point did the two lines in #1 intersect? So, (-1, -2) is the solution for the system: y = x – 1 and y = -x – 3

7. Example 1: Solve the system by graphing. 2x + y = -7 x – y = 1 *If the equations are in standard form, find the x- y-intercepts. 2x + y = -6 x-int (-3, 0) y-int (0, -6) x – y = 1 x-int (1, 0) y-int (0,-1)

8. Example 2: Graph the system and describe it as a consistent and independent, consistent and dependent, or inconsistent. 6x + 8y = -16 Use Slope Intercept Form or find the x-y- intercepts