Warm Up 1 Solve 2 x 4 y

Warm Up

1) Solve 2 x - 4 y = 7 for x To get x by itself, what is the first step? 1. 2. 3. 4. Add 2 x Subtract 2 x Add 4 y Subtract 4 y Answer Now

1. 1) Solve 2 x - 4 y = 7 for x + 4 y Add 4 y to both 2 x = 7 + 4 y sides Simplify 2 2 2. 3. Divide both sides by 2 4. Does it simplify?

2) Solve 2 x - 4 y = 7 for y To get y by itself, what is the first step? 1. 2. 3. 4. Add 2 x Subtract 2 x Add 4 y Subtract 4 y Answer Now

1. 2) Solve 2 x - 4 y = 7 for y - 2 x Subtract 2 x from -4 y = 7 - 2 x both sides Simplify -4 -4 2. 3. Divide both sides by -4 4. Does it simplify?

3) Solve for y. What is the first step? 1. 2. 3. 4. Multiply by 3 Divide by 3 Add a Subtract a Answer Now

3) Solve for y: 1. Clear the fraction – multiply both sides by 3 2. Simplify 3. Subtract a from both sides 4. Simplify y + a = 3 c -a -a y = 3 c - a

4) Solve for y: 4 x – 2 y = 12 1. 2. 3. 4. -4 x + 12 4 x - 12 -2 x + 6 2 x - 6 Answer Now

1. 2. 3. 4. 4) Solve for y: 4 x – 2 y = 12 4 x 4 x Subtract 4 x from both sides -2 y = 12 – 4 x Simplify -2 -2 Divide both sides by -2 y = -6 + 2 x Does it simplify? or y = 2 x - 6 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 2. 3. 4.

5) The formula for the perimeter of a rectangle is P = 2 l + 2 w. Which equation solves the formula for w? 1. l = P - w 2. 3. 4.