#41. Solve each equation. 1: Solving Two-Step Equations 18 + 3x = 30.

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Presentation transcript:

#41

Solve each equation. 1: Solving Two-Step Equations x = 30

Undo operations in the reverse of the Order of Operations. First undo addition or subtraction. Then undo multiplication or division. Helpful Hint

Example 2: Solving Two-Step Equations – 2 = 1 Solve. Check the answer. x3x3

Example 3: Solving Two-Step Equations = 6 Solve. Check the answer. x

Example 4 7 x – 5 = 23 Solve each equation.

Example 5 Solve each equation. x – 16 = 9 3

Example 6 = 49 Solve. Check the answer. x

Nancy saved $87 of the money she made babysitting. She wants to buy CDs that cost $15 each, along with a set of headphones that costs $12. How many CDs can she buy? Example 7: Consumer Math Application

Example 8 Kaia earned $425 last week. She wants to put $350 in the bank and buy some DVDs. Each DVD costs $25. Write a two-step equation to represent the situation. Then solve the equation. How many DVDs can she buy?

Example 9: Working Backward with Function Rules The rule for a certain function is to multiply the input by 5 and subtract 4. Find the input value when the output is 11.

Example 10 The rule for a certain function is to multiply the input by 2 and subtract 8. Find the input value when the output is 3.