Math Problem Statement

Solve the following system of equations using the substitution method: 1) y = 2x + 9 2) -4x + 2y = 1

Solution

Let's solve the given system of linear equations using the substitution method:

Given System of Equations

  1. y=2x+9y = 2x + 9
  2. 4x+2y=1-4x + 2y = 1

Step 1: Substituting yy from Equation (1) into Equation (2)

Since y=2x+9y = 2x + 9, we substitute this into the second equation:

4x+2(2x+9)=1-4x + 2(2x + 9) = 1

Step 2: Simplify the equation

4x+4x+18=1-4x + 4x + 18 = 1 18=118 = 1

This is a contradiction, meaning the system of equations is inconsistent. Therefore, there is no solution to this system.

The correct answer is "DNE" (Does Not Exist) for both blanks as specified.

Would you like any further details or explanations? Here are some follow-up questions for practice:

  1. How do you identify if a system is inconsistent without solving it?
  2. What are the different types of solutions a system of linear equations can have?
  3. Can the substitution method always be used, or are there situations where another method is preferred?
  4. What does it mean geometrically for a system of equations to have no solution?
  5. How can you determine if two equations represent the same line?

Tip: Always simplify the equations fully when using substitution to avoid missing contradictions.

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Linear Equations
Substitution Method
Inconsistent Systems

Formulas

y = 2x + 9
-4x + 2(2x + 9) = 1

Theorems

Inconsistent Systems Theorem
Substitution Method

Suitable Grade Level

Grades 9-11