8.1 pt 1 Solving equations with addition/subtraction

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Presentation transcript:

8.1 pt 1 Solving equations with addition/subtraction Objective: students will learn how to solve one step equations by addition or subtraction.

Definitions Inverse operation: equation that undoes itself. x – 5 = 23 Add 5 to undo your subtract 5 Equivalent Equations: both sides of equation equal. Need to find All Solutions to problems.

Solve equations w/subtraction HINT: do to one side, you do to the other. X + 2 = 19 -7 = y + 14 X + 1 = 8 3 + x = 41

Student Problems x + 30 = -24 -2 = z + 7 X + 7 = 10 20 = g + 39

Solve equation by addition c – 29 = 30

Student Problems n – 6 = -19 a – 14 = 8 b – 30 = -70 p – 24 = -53 X - 65 = 89

Word Problems You bought a cd player for $100 after a $20 mail in rebate. Find the price of the cd player before the rebate. Know:

Student Example Alexis was holding a cat. Alexis steps on a scale and the scale reads 172 lbs. Alexis weighs 90lbs. Find the weight of the cat. Know:

Wrap-up Questions/Comments Hw: worksheet