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

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Presentation transcript:

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

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

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

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

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 = = 9

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 = = 11

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

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

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

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