Question

2x + 4y = 24
if y = -3
then x = ____?

Answer 1

x = 18

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Equality Properties

• Multiplication Property of Equality
• Division Property of Equality
• Addition Property of Equality
• Subtract Property of Equality

Explanation:

Step 1: Define

2x + 4y = 24

y = -3

Step 2: Solve for x

1. Substitute in y: 2x + 4(-3) = 24
2. Multiply: 2x - 12 = 24
3. Isolate x term: 2x = 36
4. Isolate x: x = 18