Solve with substitution
y = x - 15
y = 4x
1 answer:
Answer:
(-5, -20)
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Equality Properties
- Multiplication Property of Equality
- Division Property of Equality
- Addition Property of Equality
- Subtraction Property of Equality
<u>Algebra I</u>
- Coordinates (x, y)
- Solving systems of equations using substitution/elimination
Step-by-step explanation:
<u>Step 1: Define</u>
y = x - 15
y = 4x
<u>Step 2: Solve for </u><em><u>x</u></em>
<em>Substitution</em>
- Substitute in <em>y</em>: 4x = x - 15
- [Subtraction Property of Equality] Subtract <em>x</em> on both sides: 3x = -15
- [Division Property of Equality] Divide 3 on both sides: x = -5
<u>Step 3: Solve for </u><em><u>y</u></em>
- Define original equation: y = 4x
- Substitute in <em>x</em>: y = 4(-5)
- Multiply: y = -20
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