Math Problem Statement

What is the solution to the system of equations y = -2x - 4 and y = 2x + 4?

Solution

The system of linear equations given in the image is:

y=2x4y = -2x - 4 y=2x+4y = 2x + 4

We need to find the solution, which corresponds to the point where the two lines intersect. Let's solve it algebraically to determine the intersection point.


Step 1: Set the equations equal to each other

Since both equations are equal to yy, we equate them:

2x4=2x+4-2x - 4 = 2x + 4

Step 2: Solve for xx

Move the 2x2x from the right side to the left side:

2x2x=4+4-2x - 2x = 4 + 4

4x=8-4x = 8

Now, divide both sides by 4-4:

x=2x = -2

Step 3: Substitute x=2x = -2 into one of the original equations

Let’s use the second equation y=2x+4y = 2x + 4:

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

y=4+4=0y = -4 + 4 = 0


Step 4: Write the solution

The intersection point, and thus the solution to the system, is:

(2,0)\boxed{(-2, 0)}


Verification with the graph

Looking at the graph, the two lines indeed intersect at the point (2,0)(-2, 0), confirming that our algebraic solution is correct.


Do you have any further questions, or would you like additional details?


Related questions:

  1. How do you graph linear equations by hand?
  2. What methods exist for solving systems of linear equations?
  3. What happens when two lines in a system are parallel?
  4. How do you interpret a system with infinitely many solutions?
  5. How can you check your solutions graphically and algebraically?

Tip: When solving systems of equations graphically, always double-check that both equations are in slope-intercept form for easier graphing.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing Systems of Equations

Formulas

y = mx + b (Slope-Intercept Form)
Solving Systems of Equations by Substitution

Theorems

Intersection of Two Lines

Suitable Grade Level

Grades 8-10