Math Problem Statement

Solve the system by substitution: -4x + 7y = -41 and x = y + 5

Solution

To solve the given system of equations by substitution, here are the steps:

System of Equations:

  1. 4x+7y=41-4x + 7y = -41
  2. x=y+5x = y + 5

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

Replace xx in 4x+7y=41-4x + 7y = -41: 4(y+5)+7y=41-4(y + 5) + 7y = -41

Step 2: Expand and simplify.

4y20+7y=41-4y - 20 + 7y = -41 3y20=413y - 20 = -41

Step 3: Solve for yy.

3y=41+203y = -41 + 20 3y=213y = -21 y=7y = -7

Step 4: Substitute y=7y = -7 into x=y+5x = y + 5.

x=7+5x = -7 + 5 x=2x = -2

Final Solution:

The solution to the system is: (x,y)=(2,7)(x, y) = (-2, -7)

Would you like further clarification on this process or any specific steps?

Related Questions:

  1. Can you solve a similar system where the second equation is x=2y+3x = 2y + 3?
  2. How would the solution change if x=y5x = y - 5?
  3. Can this problem be solved graphically? How?
  4. What is substitution, and why is it used to solve systems of equations?
  5. What happens if the system of equations has no solution or infinitely many solutions?

Tip:

Always double-check your substitution step by plugging the values back into both original equations to verify!

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Math Problem Analysis

Mathematical Concepts

Linear equations
Substitution method
Systems of equations

Formulas

Substitution: Replace one variable with its equivalent expression in another equation.

Theorems

Basic principles of solving linear systems by substitution.

Suitable Grade Level

Grades 8-10