Do Now Pg 52 #18-21.

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Do Now Pg 52 #18-21

1.5 Solving Inequalities Learning Goals: solve and graph inequalities Inequality Old Symbol New, more mature symbol < ○ ) > ( ≤ ● ] ≥ [ Learning Goals: solve and graph inequalities write and solve compound inequalities

Features of Inequalities Inequalities have more than 1 solution When you MULTIPLY or DIVIDE by a negative number you MUST flip the sign. What happens if we multiply the inequality by –1 ?

EX 1 Set Builder Notation: Interval Notation:

EX 2

compound inequality: a pair of inequalities joined by AND or OR AND – BOTH are true OR – At least ONE is true

EX 3

Phone number Key in the 1st three digits of your phone number (not the area code) Multiply by 80 Add 1 Multiply by 250 Add the last four digits of your phone # Add the last four digits of your phone # AGAIN Subtract 250 Divide by 2 SEE YOUR PHONE NUMBER ON YOUR CALCULATOR???

EX 4

EX 5

****Special Cases**** EX 6

****Special Cases**** EX 7

****Special Cases**** EX 8

****Special Cases**** EX 9

In your group, work the following problems. Ex 10 In your group, work the following problems.