Question

-4x + 5y = 12. Value of y when x equals -13

Answer 1

-8

Explanation:

-4x + 5y =12

-4(-13) + 5y =12

52 + 5y =12

5y= -52 + 12

5y/5 = -40/5

y= -8

Answer 2

y = -8

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
• Subtraction Property of Equality

Explanation:

Step 1: Define

-4x + 5y = 12

x = -13

Step 2: Solve for y

1. Substitute in x: -4(-13) + 5y = 12
2. Multiply: 52 + 5y = 12
3. [Subtraction Property of Equality] Isolate y term: 5y = -40
4. [Division Property of Equality] Isolate y: y = -8