Math Problem Statement

Solve the system of linear equations by substitution: x = 17 - 4y and y = x - 2

Solution

Let's solve this system of linear equations using substitution.

We have the following two equations:

  1. x=174yx = 17 - 4y
  2. y=x2y = x - 2

Step 1: Substitute xx from the first equation into the second equation.

From equation 1: x=174yx = 17 - 4y Substitute this into equation 2: y=(174y)2y = (17 - 4y) - 2 Simplify: y=174y2y = 17 - 4y - 2 y=154yy = 15 - 4y

Step 2: Solve for yy.

Add 4y4y to both sides: y+4y=15y + 4y = 15 5y=155y = 15

Divide both sides by 5: y=3y = 3

Step 3: Substitute y=3y = 3 back into the first equation to solve for xx.

From equation 1: x=174yx = 17 - 4y Substitute y=3y = 3: x=174(3)x = 17 - 4(3) x=1712x = 17 - 12 x=5x = 5

Final Solution:

The solution is (x,y)=(5,3)(x, y) = (5, 3).

Would you like further details on any step? Here are some related questions to explore:

  1. What is the method of substitution in solving linear systems?
  2. How would the solution change if one of the equations were rearranged?
  3. What is the graphical interpretation of this solution?
  4. Can all linear systems be solved using substitution?
  5. How does substitution compare to the elimination method?

Tip: When using substitution, always simplify your expressions as much as possible before solving.

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Equations
Substitution Method

Formulas

Substitute x from the first equation into the second
y = x - 2

Theorems

Method of Substitution for solving systems of linear equations

Suitable Grade Level

Grades 7-10