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Objectives The student will be able to: 1. solve equations using addition and subtraction. SOL: A.1, A.3 Designed by Skip Tyler, Varina High School.

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Presentation on theme: "Objectives The student will be able to: 1. solve equations using addition and subtraction. SOL: A.1, A.3 Designed by Skip Tyler, Varina High School."— Presentation transcript:

1 Objectives The student will be able to: 1. solve equations using addition and subtraction. SOL: A.1, A.3 Designed by Skip Tyler, Varina High School

2 1) Solve r + 16 = -7 Think of this as a balanced scale. On one side, you have r On the other side, you have -7. The equal sign means that it is balanced now. If you put something on one side, you must put the same thing on the other to keep it balanced.

3 1) Solve r + 16 = -7 The objective is to get the variable by itself. What number is on the same side as the variable? 16 We must move the 16 to the other side.

4 1) Solve r + 16 = -7 Instead of adding 16, we do the opposite Subtract 16 from both sides r = Simplify the problem. r = -23

5 Check your answer. Put -23 back into the original problem in the place of r = = -7 √ You can check every answer to see if you are right!!

6 2) Solve x + 2 = -3 Get the variable by itself. What number is on the same side as the variable? 2 Do the opposite of adding 2 x = x = -5

7 Check your answer = = -3 √ On homework and tests, be sure to check your work!! There is no reason why you should miss a problem!

8 3) Solve 8 = m = m = m Check: 8 = = 8 √

9 4) Solve y + (-3) = 7 Rewrite + (- ) with 1 sign + (- ) = - and - (- ) = + y - 3 = 7 y = y = 10 Check: 10 + (-3) = 7 7 = 7 √

10 5) Solve -x - (-2) = 1 Rewrite: -x + 2 = 1 -x = x = -1 “The opposite of x equals -1” x = 1 Check -(1) + 2 = 1 1 = 1 √


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