I need to solve for x

mAB = 7

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Algebra I

Terms/Coefficients/Degrees

Step-by-step explanation:

Step 1: Define

Set up equation.

mAB + mBC = mAC

x + 4 + 4 = 3x + 2

Step 2: Solve for x

Combine like terms:                     x + 8 = 3x + 2Isolate x terms:                             8 = 2x + 2Isolate x term:                               6 = 2xIsolate x:                                        3 = xRewrite:                                         x = 3

Step 3: Find AB

Define:                              mAB = x + 4Substitute in x:                 mAB = 3 + 4Add:                                  mAB = 7

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