Math Problem Statement

3x+2y =12 and x-y =-12

Solution

We have the system of linear equations:

  1. 3x+2y=123x + 2y = 12
  2. xy=12x - y = -12

Let's solve this step by step using the substitution or elimination method.

Step 1: Solve the second equation for xx.

From the second equation: xy=12    x=y12x - y = -12 \implies x = y - 12

Step 2: Substitute x=y12x = y - 12 into the first equation.

Now, substitute x=y12x = y - 12 into the first equation 3x+2y=123x + 2y = 12: 3(y12)+2y=123(y - 12) + 2y = 12 Distribute: 3y36+2y=123y - 36 + 2y = 12 Combine like terms: 5y36=125y - 36 = 12 Add 36 to both sides: 5y=485y = 48 Solve for yy: y=485y = \frac{48}{5}

Step 3: Substitute y=485y = \frac{48}{5} back into x=y12x = y - 12.

Now that we have y=485y = \frac{48}{5}, substitute this value into the expression for xx: x=48512x = \frac{48}{5} - 12 Convert 12 to a fraction with denominator 5: x=485605=125x = \frac{48}{5} - \frac{60}{5} = \frac{-12}{5}

Solution:

The solution to the system of equations is: x=125,y=485x = \frac{-12}{5}, \quad y = \frac{48}{5}

Would you like further details or have any questions?


Here are 5 related questions:

  1. How do you solve a system of equations using the elimination method?
  2. Can you solve a system of equations graphically?
  3. What is the determinant of a system of linear equations?
  4. How do you solve systems with more than two equations?
  5. What is the significance of consistent and inconsistent systems?

Tip: Always double-check solutions by substituting them back into the original equations to verify correctness.

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Linear Equations
Substitution Method

Formulas

Substitution method: Solve one equation for a variable and substitute into another equation
Linear equation: ax + by = c

Theorems

Basic properties of linear equations
Elimination and substitution methods

Suitable Grade Level

Grades 8-10