Find the value of y showing your steps or explaining your thinking. (2 pts.)

y = 54

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Algebra I

Equality Properties

Geometry

Congruency All angles in a triangle add up to 180°

Step-by-step explanation:

Step 1: Define

3(x + 7)° = 63°

3(x + 7)° + 63° + y° = 180°

Step 2: Solve for x

Divide 3 on both sides:                    x + 7 = 21 Subtract 7 on both sides:                 x = 14

Step 3: Solve for y

Substitute in x:                    3(14 + 7) + 63 + y = 180(Parenthesis) Add:              3(21) + 63 + y = 180Multiply:                               63 + 63 + y = 180Combine like terms:           y + 126 = 180Isolate y:                              y = 54

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