Graphing Linear Inequalities Objective- To graph inequalities on the coordinate plane.

Recall… Graph n < 3 on a number line

To draw a graph of an inequality such as y -3x + 2 on the coordinate plane you must first draw the graph of y=2x - 3. x y This line separates the coordinate plane into two regions. The line is the BOUNDARY of the two regions.

x y Solid line Dashed line >< To determine which region is the solution to y -3x + 2 you must test a point in either region. For example lets test the origin (0, 0) y -3x (0) This is NOT true therefore it has to be in the opposite region

Graph y > 3 on the coordinate plane. x y

Graph x - 2 on the coordinate plane. x y

Graph y - 3x + 2 on the coordinate plane. x y Boundary Line y = - 3x + 2 m = - 3 b = 2 Test a point not on the line test (0,0) 0 -3(0) + 2 Not true!

Graph on the coordinate plane. 3x - 4y > x - 4y > - 3x y < x - 3 m = b = - 3 Boundary Line x y

Problem If you have less than $5.00 in nickels and dimes, find an inequality and sketch a graph to describe how many of each coin you have. Let n = # of nickels Let d = # of dimes 0.05 n d < 5.00 or 5 n + 10 d < 500

nd n d