Today we will solve equations with two variables

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

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

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

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

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

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

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

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

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

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

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

Print slides 13 -16 for homework

Complete the Table Y = 3 x + 1 x y 1 2 3 4

Complete the Table Y = x + 17 x 5 6 7 y

Complete the Table Y = 2 x + 3 x 3 6 8 y

Complete the Table Y = 5 x x y 2 30 9