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# 6-2 Solving Systems Using Substitution - PowerPoint PPT Presentation

6-2 Solving Systems Using Substitution . Objective: Ditto “ “. 6-2 Solving Systems Using Substitution . You can solve linear systems by solving one of the equations for one of the variables. Then substitute the expression for the variable in the other equation.

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### 6-2 Solving Systems Using Substitution

Objective: Ditto “ “

6-2 Solving Systems Using Substitution

• You can solve linear systems by solving one of the equations for one of the variables.

• Then substitute the expression for the variable in the other equation.

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• Example 1: Use substitution to solve

• y = 3x

• x + y = -32

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6-2 Solving Systems Using Substitution

• Example 2: Use substitution to solve

• 3y + 4x = 14

• -2x + y = -3

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6-2 Solving Systems Using Substitution

• Example 3: P. 374

• A snack bar sells two sizes of snack packs. Large is \$5 & small is \$3. One day the snack bar sold 60 packs for \$220. How many small packs did it sell?

• Example 3: A snack bar sells two sizes of snack packs. Large is \$5 & small is \$3. One day the snack bar sold 60 packs for \$220. How many small packs did it sell?

• Write 2 equations and solve with sub.

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• Example 4: Solve with sub.

• x = -2y + 4

• 3.5x + 7y = 14

• Example 4: Solve with sub.

• y = 3x – 11

• Y – 3x = -13

6-2 Solving Systems Using Substitution

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