Math Problem Statement

Graph the following system of equations and find any solutions. Check the answers. Identify the system as consistent or inconsistent. If the system is consistent, state whether the equations are dependent or independent. 2x - y = -4 -5x + y = 13

Solution

Let's solve the system of equations and determine its consistency and dependency.

The system of equations is:

  1. 2xy=42x - y = -4
  2. 5x+y=13-5x + y = 13

To solve this system, we can use the method of elimination or substitution. Let's use substitution.

From the first equation:

y=2x+4y = 2x + 4

Substitute yy in the second equation:

5x+(2x+4)=13-5x + (2x + 4) = 13

Simplify and solve for xx:

5x+2x+4=13-5x + 2x + 4 = 13 3x+4=13-3x + 4 = 13 3x=9-3x = 9 x=3x = -3

Now that we have xx, substitute it back into the expression for yy:

y=2(3)+4y = 2(-3) + 4 y=6+4y = -6 + 4 y=2y = -2

The solution to the system is (x,y)=(3,2)(x, y) = (-3, -2).

To determine consistency and dependency:

  • The system is consistent because there is at least one solution.
  • It's independent because the equations are not multiples of each other and have exactly one solution.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Systems of Equations

Formulas

Substitution Method
Equation Rearrangement

Theorems

Consistent and Independent Systems

Suitable Grade Level

Grades 8-10