Unit 2 Day 4 1/17/12 Turn in worksheet 2-2 and vocabulary definitions Get calculator Do bell ringer Unit 2 Day 4: Bell ringer In the empty boxes in each table, give two numbers that multiply to be the bottom number and add to be the top number. 1 2. 3. 4. 5. 9 20 9 18 12 32 3 -10 -14 40

announcements Vocab quiz on Thursday Unit 2 test on Friday Rough draft of projects due on Friday $5 fee due Feb 3 If you were not here Friday come see me after class for some handouts you missed If you paid on Friday get your receipt off the door

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Homework: worksheet 2-2

Unit 2 Day 4 Notes LITERAL EQUATIONS (Literal equations are equations that have multiple variables and you are asked to solve for one of them)

1) Solve 2x - 4y = 7 for x To get x by itself, what is the first step? Add 2x Subtract 2x Add 4y Subtract 4y Answer Now

2) Solve 2x - 4y = 7 for y To get y by itself, what is the first step? Add 2x Subtract 2x Add 4y Subtract 4y Answer Now

2) Solve 2x - 4y = 7 for y - 2x - 2x -4y = 7 - 2x -4 -4 D U 2) Solve 2x - 4y = 7 for y · -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!

3) Solve for y. What is the first step? Multiply by 3 Divide by 3 Add a Subtract a Answer Now

3) Solve for y: y + a = 3c -a -a y = 3c - a Draw “the river” D U 3) Solve for y: + a ÷ 3 · 3 - a Draw “the river” Clear the fraction – multiply both sides by 3 Simplify Subtract a from both sides y + a = 3c -a -a y = 3c - a

4) Solve for y: 4x – 2y = 12 -4x + 12 4x - 12 -2x + 6 2x - 6 Answer Now

4) Solve for y: 4x – 2y = 12 - 4x - 4x -2y = 12 – 4x -2 -2 y = -6 + 2x 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!

5) The formula for the volume of a rectangular prism is V = LWH 5) The formula for the volume of a rectangular prism is V = LWH. Which equation solves the formula for L? L = V - WH Answer Now

6) The formula for the volume of a pyramid is V = 6) The formula for the volume of a pyramid is V = . Which equation solves the formula for h? h = 3Vb Answer Now