Respuesta :

Space

Answer:

y = -5

General Formulas and Concepts:

Pre-Alg

  • Order of Operations: BPEMDAS
  • Equality Properties

Step-by-step explanation:

Step 1: Define equation

-9 = 2(18) + 9y

Step 2: Solve for y

  1. Multiply:                                   -9 = 36 + 9y
  2. Subtract 36 on both sides:     -45 = 9y
  3. Divide both sides by 9:           -5 = y
  4. Rewrite:                                     y = -5

Step 3: Check

Plug in y to verify it's a solution.

  1. Substitute:                    -9 = 2(18) + 9(-5)
  2. Multiply:                        -9 = 36 - 45
  3. Subtract:                       -9 = -9

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