# 3.1 notes - same way the “arrow” points Practice Graph...

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Section 3.1 Inequalities and Their Graphs!

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Warm up Complete each statement with <, =, or >. 1) -3 __ -5 2) 4.29 ____ 4.8 3) (-3)(-4) ___ 12 4) _____ 4 3 5 4
Let’s talk about Inequalities Inequalities are a lot like equations, but they have lots of solutions Solution of an inequality any number that makes the inequality true. Example – The solution to z < 3 is every single number less than 3

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Is each number a solution of x ≤ 7? a. 9 b. -1 c. 2 14
Is each number a solution to 4 -2 0 4 3 - x x

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Graphing Inequalities 1. Write the inequality with the variable on the left 2. Plot the number on a number line 3. Make a circle above the number Closed circle – Open circle – 4. Shade the direction that is true. (It’s the

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Unformatted text preview: same way the “arrow” points) Practice!! Graph each inequality 3 < x y ≥-3 2 Always remember when graphing… Make sure your number line is roughly to scale This is a bad example! Label your tic marks This is a bad example! Now you try! 4-≥ b x-4 3 Writing an inequality from a graph Writing an inequality for a situation the speed limit on the interstate is 70 mph There must be at least 22 kids at football practice to scrimmage NOTE: There is a difference between “4 greater than x ” and “ x is greater than 4” Homework # ___ Page 136 (1-31 odd)...
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## This note was uploaded on 05/16/2011 for the course ALGEBRA 098 taught by Professor Johnson during the Spring '09 term at Grand Valley State.

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3.1 notes - same way the “arrow” points Practice Graph...

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