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

2. Equation – Number sentence that you have to solve (balance) using variables. 5 + x = y + 7 7x – 1 = y z = 5y - 4

3. Steps for Solving an Equation 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check

4. Let’s do one together 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check + 4 If = 7, what is ? = = + 4 = 7 + 4 = 11

5. Here’s another 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check + 4 If = 2, what is ? = = + 4 = 2 + 4 = 6

6. One More 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check + 4 If = 14, what is ? = = + 4 = 14 + 4 = 14

7. Let’s try one with letter variables n = x – 3. If x = 4, what is n? 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check n = x - 3 n = 4 - 3 n = 1 1 = 4 – 3 ? 1 = 1 !!!!!

8. Let’s try another z = 4 + y. If y = 2, what is z? 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check z = 4 + y Z = 4 + 2 z = 6 6 = 4 + 2 ? 6 = 6 !!!!!

9. Let’s try one with letter variables 2x - 1 = y. If x = 3, what is y? 1. Write down your equation. 2. Plug in the given variable. 3. Solve. 4. Check 2x - 1 = y 2 x 3 - 1 = y 5 = y 2 x 3 - 1 = 5 ? 5 = 5 !!!!!

10. 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

11. 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