Math Problem Statement

Solve the system of equations: y = x - 5, y = -7x + 3 using substitution.

Solution

The problem asks to solve the system of equations using substitution:

y=x5y = x - 5 y=7x+3y = -7x + 3

Step 1: Substituting for yy

Since both equations represent yy, we can substitute y=x5y = x - 5 into the second equation:

x5=7x+3x - 5 = -7x + 3

Step 2: Solving for xx

Now, let's solve this equation for xx:

x+7x=3+5x + 7x = 3 + 5 8x=88x = 8 x=1x = 1

Step 3: Substituting x=1x = 1 into the first equation

Now that we have x=1x = 1, substitute this value back into the first equation to find yy:

y=15y = 1 - 5 y=4y = -4

Solution:

The solution to the system is (1,4)(1, -4).

Would you like a more detailed explanation or have any questions?


Here are some related questions:

  1. How do you solve systems of equations using elimination?
  2. What happens if the system of equations has no solution?
  3. How can you check if your solution to a system is correct?
  4. What is the graphical interpretation of solving a system of equations?
  5. How does substitution differ from other methods like elimination?

Tip: Always simplify and isolate variables step by step when solving systems of equations.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
System of Equations
Substitution Method

Formulas

Equating two expressions for y: x - 5 = -7x + 3

Theorems

Substitution Method for solving systems of linear equations

Suitable Grade Level

Grades 7-9