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**Objectives The student will be able to:**

1. solve equations with variables on both sides. 2. solve equations containing grouping symbols. SOL: A.4df Designed by Skip Tyler, Varina High School

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1) Solve. 3x + 2 = 4x - 1 You need to get the variables on one side of the equation. It does not matter which variable you move. Try to move the one that will keep your variable positive.

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**1) Solve 3x + 2 = 4x - 1 - 3x - 3x 2 = x - 1 + 1 + 1 3 = x**

3 = x 3(3) + 2 = 4(3) - 1 9 + 2 = Draw “the river” Subtract 3x from both sides Simplify Add 1 to both sides Check your answer

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**2) Solve 8y - 9 = -3y + 2 + 3y + 3y 11y – 9 = 2 + 9 + 9 11y = 11 11 11**

11y = y = 1 8(1) - 9 = -3(1) + 2 Draw “the river” Add 3y to both sides Simplify Add 9 to both sides Divide both sides by 11 Check your answer

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**What is the value of x if 3 - 4x = 18 + x?**

-3 3 Answer Now

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**3) Solve 4 = 7x - 3x 4 = 4x 4 4 1 = x 4 = 7(1) - 3(1) Draw “the river”**

1 = x 4 = 7(1) - 3(1) Draw “the river” – Notice the variables are on the same side! Combine like terms Divide both sides by 4 Simplify Check your answer

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**4) Solve -7(x - 3) = -7 -7x + 21 = -7 - 21 - 21 -7x = -28 -7 -7 x = 4**

-7x = -28 x = 4 -7(4 - 3) = -7 -7(1) = -7 Draw “the river” Distribute Subtract 21 from both sides Simplify Divide both sides by -7 Check your answer

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**What is the value of x if 3(x + 4) = 2(x - 1)?**

-14 -13 13 14 Answer Now

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**5) Solve 3 - 2x = 4x – 6 + 2x +2x 3 = 6x – 6 + 6 + 6 9 = 6x 6 6**

Draw “the river” Clear the fraction – multiply each term by the LCD Simplify Add 2x to both sides Add 6 to both sides Divide both sides by 6 Check your answer 3 - 2x = 4x – 6 + 2x +2x = 6x – 6 = 6x or 1.5 = x

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**-2x -2x 5 = -3 This is never true! No solutions**

Special Case # ) 2x + 5 = 2x - 3 -2x x 5 = -3 This is never true! No solutions Draw “the river” Subtract 2x from both sides Simplify

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**Infinite solutions or identity**

Special Case # ) 3(x + 1) - 5 = 3x - 2 3x + 3 – 5 = 3x - 2 3x - 2 = 3x – 2 -3x x -2 = -2 This is always true! Infinite solutions or identity Draw “the river” Distribute Combine like terms Subtract 3x from both sides Simplify

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**What is the value of x if -3 + 12x = 12x - 3?**

4 No solutions Infinite solutions Answer Now

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**Challenge! What is the value of x if -8(x + 1) + 3(x - 2) = -3x + 2?**

-2 2 8 Answer Now

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Solve Linear Systems by Substitution January 28, 2014 Pages 435-438.

Solve Linear Systems by Substitution January 28, 2014 Pages 435-438.

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