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**Equation y + 5 y + 5 = 20 Expressions**

We can evaluate an expression, when given the value of the variable. Expressions y + 5 Equation y + 5 = 20 We can solve an equation to find the value of the variable.

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**1. The '=' sign divides the equation into two parts.**

y + 5 = 20 - 5 - 5 2. Whatever you do on one side of the equal sign, must be done to the other side. y = 15 3. You must isolate the variable by using the inverse operation.

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**1. The '=' sign divides the equation into two parts.**

2. Whatever you do on one side of the equal sign, must be done to the other side. 3. You must isolate the variable by using the inverse operation. m + 6 = 8 - 6 - 6 m = 2

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**1. The '=' sign divides the equation into two parts.**

2. Whatever you do on one side of the equal sign, must be done to the other side. 3. You must isolate the variable by using the inverse operation. 9 + w = 20 - 9 - 9 w = 11

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**1. The '=' sign divides the equation into two parts.**

2. Whatever you do on one side of the equal sign, must be done to the other side. 3. You must isolate the variable by using the inverse operation. r + 6 = 2 - 6 - 6 r = - 4

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**Practice - Solve each equation. Show all work. 1) 12 + y = 20 **

-12 -12 -7 -7 -8 -8 c = -5 y = 8 8 = r

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**3) c + 8 = 1 Do Now - Solve each equation. Show all work.**

1) m = 32 2) = 7 + r 3) c + 8 = 1 -17 -17 -8 -8 -7 -7 c = -7 m = 15 -16 = r

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**1. The '=' sign divides the equation into two parts.**

2. Whatever you do on one side of the equal sign, must be done to the other side. 3. You must isolate the variable by using the inverse operation. r -7 = 2 + 7 + 7 r = 9

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Solve each equation. 1) r - 9 = 4 2) -12 = y - 3 +3 +9 +3 +9 r =13 -9 =y

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Solve each equation. 1) r - 8 = 2 2) -15 = y - 4

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**Practice - Solve each equation. Show all work.**

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**Practice - Solve each equation. Show all work.**

4) m = 20 6) e + (-6) = -12 5) y- (-5)= 10

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