8.2 2 step equations Objective: students will use what they learned with one step equations and be able to solve a two step equation.

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Presentation transcript:

8.2 2 step equations Objective: students will use what they learned with one step equations and be able to solve a two step equation.

Information To Solve 2-step equation. Ex: 2x + 5 = 6 Isolate variable (addition/subtract) Solve for variable (multiply/divide) Ex: 2x + 5 = 6 Note: can’t have negative variable. Ex: -x = 3; need to multiply by -1 x = -3

Examples 4x + 1 = 5 2r - 9 = 1 3n + 8 = 2 12k - 17 = 31

Examples 12 – 4s = -12 -2m + 6 = 8 -2q – 63 = 47 18 – r = 42

Examples b/4 – 8 = 1 d/5 - 1 = 2 c/6 – 2 = 6 h/9 + 19 = -10

Examples x/3 + 2 = -1 h/4 + 7 = 23 y/-2 + 8 = 21 j/2 + 52 = -40

Word Problems Train has 50 cars and one locomotive. Locomotive weighs 125 tons and each car weighs same. Total weight is 4725 tons. Find weight of one car. Know: 50 cars, locomotive 125 tons, total is 4725 tons.

Word Problems You buy a drum set for $495. You put a down payment of $150 and make three equal payments. Write an equation and find the cost of each payment. Know: costs $495 down pay: $150 make 3 payments

Wrap-up Questions/Comments Hw: workbook 47