1. 3-2 MODELING AND SOLVING TWO-STEP EQUATIONS MISS BATTAGLIA – ALGEBRA 1 CP OBJECTIVE: SOLVE TWO-STEP EQUATIONS AND USE TWO-STEP EQUATIONS TO SOLVE REAL-WORLD PROBLEMS.

2. WARM UP A long-distance phone company charges $.50 for the first minute and $.15 for each additional minute. If Mark budgets $4 to call his sister once a month, how long can they talk? How much will he be charged?

3. TWO-STEP EQUATIONS A two-step equation is an equation that has two operations. Ex: 2y – 3 = 7

4. USING PROPERTIES TO SOLVE Remember… x = 1x and –x = -1x 4 – x = 4 + (-x)

5. USING PROPERTIES TO SOLVE… It takes two operations to solve the equations –x + 7 = 12. a)Subtract 7 from both sides a)Multiply each side by -1.

6. SOLVE 1) -11 = -b + 6 2) -9 – m = -2 3) 15 = 3 - x

7. SOLVE THE EQUATION

8. MONEY Suppose you have $18.75 to spend at a carnival. Admission is $5.50. How many ride tickets can you buy?

9. CLASSWORK/HOMEWORK 3-2 Worksheet