x = 15
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
Left to Right
Equality Properties
Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtract Property of Equality
Step-by-step explanation:
Step 1: Define
3x - y = 18
y = 27
Step 2: Solve for x
Substitute in y: 3x - 27 = 18Isolate x term: 3x = 45Isolate x: x = 15