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EXAMPLE 1 Solve 8x – 3x – 10 = 20. 5x – 10 = 20 Combine like terms. 5x – 10 + 10 = 20 + 10 Add 10 to each side. 5x = 30 Simplify. Divide each side by 5. x = 6 Simplify. 3.3: Solving Multi-Step Equations
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EXAMPLE 2 Solve an equation using the distributive property Solve 7x + 2(x + 6) = 39. 7x + 2(x + 6) = 39 7x + 2x + 12 = 39 9x + 12 = 39 9x + 12 – 12 = 39 – 12 9x = 27 x = 3
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Standardized Test Practice EXAMPLE 3
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GUIDED PRACTICE for Examples 1, 2, and 3 Solve the equation. Check your solution.
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Multiply by a reciprocal to solve an equation EXAMPLE 4 3x + 5 = –16 Simplify. 3x = –21 Subtract 5 from each side. x = –7 Divide each side by 3.
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Multiply by a reciprocal to solve an equation EXAMPLE 4 GUIDED PRACTICE for Example 4 Solve the equation. Check your solution.
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Write and solve an equation EXAMPLE 5 Let x = number of hours not flying
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EXAMPLE 5 2500 = 25(336 – x) Write equation. 2500 = 8400 – 25x Distributive property –5900 = –25x Subtract 8400 from each side. 236 = x Divide each side by –25. Write and solve an equation
Homework 3.3 :
Homework 3.3 Pages: 150 – 153
Exs. 4 – 34 even, 38, 44, 45