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6-2 Solving Systems Using Substitution

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6-2 Solving Systems Using Substitution

Objective: Ditto “ “

- 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.

6-2 Solving Systems Using Substitution

- Example 1: Use substitution to solve
- y = 3x
- x + y = -32

Choose wisely . . .

6-2 Solving Systems Using Substitution

Choose wisely . . .

- Example 2: Use substitution to solve
- 3y + 4x = 14
- -2x + y = -3

6-2 Solving Systems Using Substitution

Choose wisely . . .

- 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.

6-2 Solving Systems Using Substitution

- Example 4: Solve with sub.
- x = -2y + 4
- 3.5x + 7y = 14

- Example 4: Solve with sub.
- y = 3x – 11
- Y – 3x = -13

HW: p. 375 12 – 36 every third

6-2 Solving Systems Using Substitution