1. Today we will solve equations with two variables. Solve = figure out

2. Think Pair Share 3 + n = 12 V – 6 = 20 5y = 20 35 ÷ r = 7 Z ÷ 2 = 8

3. Variables = unknown numbers represented by a symbol or a letter = Variable = 5 x 2 = n ÷

4. Equation – Number sentence that you have to solve using variables. 5 + x = y + 7 X = 3 Y = ?

5. Steps for Solving an Equation 1. Write down your equation. 2. Re-write the equation by plugging in the given information. 3. Solve for the unknown variable. 4. Check Example: g = 2k – 1. If k = 5, what is g? g = 2k – 1. If k = 5, what is g? G = 2k – 1 G = 2 x 5 – 1 G = 10 – 1 G = 9 9 = 2 x 5 – 1 9 = 10 - 1 9 = 9

6. Let’s do one together 1. Write down your equation. 2. Re-write the equation by plugging in the given information. 3. Solve for the unknown variable. 4. Check + 4 If = 7, what is ? = = + 4 = 7 + 4 = 11

7. Solve This Equation on your White Boards 1. Write down your equation. 2. Re-write the equation by plugging in the given information. 3. Solve for the unknown variable. 4. Check n = x – 3. If x = 15, what is n? a.18 b.5 c.12 d.13

8. Complete the Table = Variable xY = x+2 1 Y = 1 + 2 3 2 ? 3 ? y

9. Complete the Table xy 13 2? 3? Y = 2x + 1 a.4 and 5 b.4 and 6 c.5 and 6 d.5 and 7

10. What did you learn today? What is a variable? What is an equation? Solve this equation: a = 6b – 1. If b = 3, what is a? a = 6b – 1. If b = 3, what is a? a. 18 a. 18 b. 19 b. 19 c. 8 c. 8 d. 17 d. 17