solve literal equations (formulas) for a specified variable. SOL: A.1

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solve literal equations (formulas) for a specified variable. SOL: A.1

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solve literal equations (formulas) for a specified variable. SOL: A.1

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ObjectiveThe student will be able to:

solve literal equations (formulas) for a specified variable.

SOL: A.1

Designed by Skip Tyler, Varina High School

Answer Now

- Add 2x
- Subtract 2x
- Add 4y
- Subtract 4y

Ask yourself,

What is the first thing we are doing to x?

What is the second thing?

DO UNDO

· 2

-4y

Follow the steps in the ‘undo’ column to isolate the variable.

+4y

÷ 2

Complete the undo column by writing the opposite operations in opposite order.

D U

· 2

-4y

+4y

÷ 2

+ 4y + 4y

2x = 7 + 4y

2 2

- Draw “the river”
- Add 4y to both sides
- Simplify
- Divide both sides by 2
- Does it simplify?

This fraction cannot be simplified because both terms in the numerator are not divisible by 2.

Answer Now

- Add 2x
- Subtract 2x
- Add 4y
- Subtract 4y

D U

· -4

+2x

-2x

÷ -4

- 2x - 2x

-4y = 7 - 2x

-4 -4

- Draw “the river”
- Subtract 2x from both sides
- Simplify
- Divide both sides by -4
- Does it simplify?

Nope!

Answer Now

- Multiply by 3
- Divide by 3
- Add a
- Subtract a

D U

+ a

÷ 3

· 3

- a

- Draw “the river”
- Clear the fraction – multiply both sides by 3
- Simplify
- Subtract a from both sides
- Simplify

y + a = 3c

-a -a

y = 3c - a

Answer Now

- -4x + 12
- 4x - 12
- -2x + 6
- 2x - 6

D U

4) Solve for y: 4x – 2y = 12

· -2

+ 4x

- 4x

÷ -2

- 4x - 4x

-2y = 12 – 4x

-2 -2

y = -6 + 2x

or y = 2x - 6

- Draw “the river”
- Subtract 4x from both sides
- Simplify
- Divide both sides by -2
- Does it simplify?

Yes!

Answer Now

- L = V - WH

Answer Now

- h = 3Vb