Question

-3x + 40 = -23

A) -21
B)5.6
C)21
D)-32.3

Answer 1

C) 21

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

Explanation:

Step 1: Define

-3x + 40 = -23

Step 2: Solve for x

1. Isolate x term: -3x = -63
2. Isolate x: x = 21

Step 3: Check

Plug in x into the original equation to verify it's a solution.

1. Substitute in x: -3(21) + 40 = -23
2. Multiply: -63 + 40 = -23
3. Add: -23 = -23

Here we see that -23 does indeed equal -23.

∴ x = 21 is the solution to the equation.