Math Problem Statement

Felicia has the following system of equations on her math homework. 3x – 5y = 22 y = ‒5x + 32

What is the value of x in the solution to this system of equations?

Group of answer choices

-6.5

0.5

6.5

-0.5

Solution

We are given the following system of equations:

  1. 3x5y=223x - 5y = 22
  2. y=5x+32y = -5x + 32

To solve for xx, we'll substitute the expression for yy from the second equation into the first equation.

Step 1: Substitute y=5x+32y = -5x + 32 into the first equation:

3x5(5x+32)=223x - 5(-5x + 32) = 22

Step 2: Distribute the -5 across the terms inside the parentheses:

3x+25x160=223x + 25x - 160 = 22

Step 3: Combine like terms:

28x160=2228x - 160 = 22

Step 4: Add 160 to both sides:

28x=18228x = 182

Step 5: Solve for xx by dividing both sides by 28:

x=18228=6.5x = \frac{182}{28} = 6.5

Thus, the value of xx is 6.56.5.

The correct answer is: 6.5

Would you like further details or explanations?

Here are five related questions to deepen your understanding:

  1. How can you check if your solution is correct by substituting back into both equations?
  2. What is the value of yy corresponding to x=6.5x = 6.5?
  3. What is substitution method in solving systems of equations?
  4. What other methods can be used to solve systems of equations, besides substitution?
  5. How can you tell if a system of equations has no solution or infinitely many solutions?

Tip: Always double-check your solutions by plugging the values of the variables back into the original equations.

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Linear Equations
Substitution Method

Formulas

Substitution method for solving systems of equations
Linear equation in the form y = mx + b

Theorems

Properties of linear equations
Solving systems of equations by substitution

Suitable Grade Level

Grades 8-10