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Unit 2 Day 4 1/17/12 1. Turn in worksheet 2-2 and vocabulary definitions 2. Get calculator 3. 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 9 20 2. 9 18 3. 12 32 4. 3 -10 5. -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 Clear your desks • LAST PROBE UNTIL MAY 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? 1. 2. 3. 4. 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? 1. 2. 3. 4. Add 2x Subtract 2x Add 4y Subtract 4y Answer Now D U 1. 2. 3. 4. 2) Solve 2x - 4y = 7 for y - 2x - 2x Draw “the river” -4y = 7 2x Subtract 2x from both sides -4 -4 Simplify 7 2x Divide both sides y by -4 4 5. Does it simplify? Nope! · -4 -2x +2x ÷ -4 ya 3) Solve c for y. 3 What is the first step? 1. 2. 3. 4. Multiply by 3 Divide by 3 Add a Subtract a Answer Now D U 3) Solve for y: 1. Draw “the river” 2. Clear the fraction – multiply both sides by 3 3. Simplify 4. Subtract a from both sides 5. Simplify 3 +a ya ÷3 c 3 ya c 3 3 y + a = 3c -a -a y = 3c - a ·3 -a 4) Solve for y: 4x – 2y = 12 1. 2. 3. 4. -4x + 12 4x - 12 -2x + 6 2x - 6 Answer Now D U · -2 - 4x + 4x ÷ -2 1. 2. 3. 4. 4) Solve for y: 4x – 2y = 12 4x 4x Draw “the river” -2y = 12 – 4x Subtract 4x from both sides -2 -2 Simplify y = -6 + 2x Divide both sides by -2 or y = 2x - 6 5. Does it simplify? Yes! 5) The formula for the volume of a rectangular prism is V = LWH. Which equation solves the formula for L? 1. L = V - WH VH 2. L W VW 3. L H 4. L V HW Answer Now 6) The formula for the volume of a pyramid 1 is V = bh . Which equation solves the 3 formula for h? 1. h = 3Vb 3b 2. h V 3V 3. h b 4. h V 3b Answer Now