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Solve equations using addition and subtraction. https://www.youtube.com/watch?v=W7fPsSw74TM 1) Solve r + 16 = -7 Think of this equation as a balance scale. Whatever you do to one side has to be done to the other to keep it balanced! 1) Solve r + 16 = -7 To solve, you must get the variable by itself. What number is on the same side as r? 16 To get r by itself, we must undo the “add 16”. What is the opposite of adding 16? Subtracting 16 2. 1) Solve r + 16 = -7 Draw a wall to 16 -16 separate the equation into 2 sides r = -23 Subtract 16 from both 3. sides Write your answer 1. 2) Solve x + 2 = -3 Get the variable by itself. What is your first step? 1. 2. 3. 4. Add 2 to both sides Subtract 2 from both sides Add 3 to both sides Subtract 3 from both sides Answer Now 2. 2) Solve x + 2 = -3 Draw “the wall” to 2 2 separate the equation into 2 sides x = -5 Subtract 2 from both 3. sides Write the answer 1. 3) Solve 8 = m - 3 1. 2. 3. 4. m=5 m = 11 m = 24 m = 8/3 Answer Now 3) Solve 8 = m - 3 +3 +3 11= m 4) Solve y + -3 = 7 - -3 y - -3 = 10 5) Solve. x - -2 = 1 + -2 + -2 x = -1 Solve y – -3 = 7 1. 2. 3. 4. y = 10 y=4 y = -10 y = -4 Answer Now