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Radda [10]
3 years ago
13

Solve the system using substitution. X + 5y = 0 3y + 2x = -21 ([?], 1)

Mathematics
1 answer:
Tpy6a [65]3 years ago
8 0

Answer:

(-15, 3)

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

<u>Algebra I</u>

  • Solving systems of equations using substitution/elimination

Step-by-step explanation:

<u>Step 1: Define Systems</u>

x + 5y = 0

3y + 2x = -21

<u>Step 2: Rewrite Systems</u>

x + 5y = 0

  1. Subtract 5y on both sides:          x = -5y

<u>Step 3: Redefine Systems</u>

x = -5y

3y + 2x = -21

<u>Step 4: Solve for </u><em><u>y</u></em>

<em>Substitution</em>

  1. Substitute in <em>x</em>:                     3y + 2(-5y) = -21
  2. Multiply:                                3y - 10y = -21
  3. Combine like terms:             -7y = -21
  4. Isolate <em>y</em>:                                y = 3

<u>Step 5: Solve for </u><em><u>x</u></em>

  1. Define equation:                    x + 5y = 0
  2. Substitute in <em>y</em>:                       x + 5(3) = 0
  3. Multiply:                                  x + 15 = 0
  4. Isolate <em>x</em>:                                 x = -15
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