Solving eqnsaddsub

Objective The student will be able to: solve equations using addition and subtraction. Designed by Skip Tyler, Varina High School

[object Object],[object Object]

1) Solve r + 16 = -7 ,[object Object],Whatever you do to one side has to be done to the other to keep it balanced! r + 16 -7 =

1) Solve r + 16 = -7 ,[object Object],[object Object],[object Object],[object Object],[object Object]

1) Solve r + 16 = -7 ,[object Object],[object Object],[object Object],[object Object],- 16 -16 r = -23 -23 + 16 = -7

2) Solve x + 2 = -3 Get the variable by itself. What is your first step? ,[object Object],[object Object],[object Object],[object Object],Answer Now

2) Solve x + 2 = -3 ,[object Object],[object Object],[object Object],[object Object],- 2 - 2 x = -5 -5 + 2 = -3 On homework and tests, be sure to check your work!! There is no reason why you should miss a problem!

3) Solve 8 = m - 3 ,[object Object],[object Object],[object Object],[object Object],Answer Now

3) Solve 8 = m - 3 + 3 + 3 11= m 8 = 11 - 3 ,[object Object],[object Object],[object Object],[object Object]

When solving equations, we want to eliminate double signs. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],As a general rule, replace “+ (- )” with “–” and “– (- )” with “+” . This will make things less confusing in the future!

4) Solve y + (-3) = 7 y – 3 = 7 + 3 +3 y = 10 10 + (-3) = 7 ,[object Object],[object Object],[object Object],[object Object],[object Object]

5) Solve. - x - (-2) = 1 -x + 2 = 1 - 2 - 2 - x = -1 x = 1 -( 1 ) + 2 = 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Solve -y – (-3) = 7 ,[object Object],[object Object],[object Object],[object Object],Answer Now

Journal ,[object Object],[object Object]

Solving eqnsaddsub

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