Math Problem Statement

Match the system of linear equations with the corresponding graph. Use the graph to estimate the solution.

Solution

Let's solve this system of linear equations and match it with the graph provided.

The equations are:

  1. y=23x3y = \frac{2}{3}x - 3
  2. y=2x+5y = -2x + 5

Step 1: Graphing the first equation

The equation y=23x3y = \frac{2}{3}x - 3 is in slope-intercept form, y=mx+by = mx + b, where:

  • m=23m = \frac{2}{3} (slope)
  • b=3b = -3 (y-intercept)

To graph this:

  • The line passes through (0,3)(0, -3) on the y-axis.
  • The slope 23\frac{2}{3} means for every 3 units moved to the right, the line moves up by 2 units.

Step 2: Graphing the second equation

The second equation y=2x+5y = -2x + 5 is also in slope-intercept form, where:

  • m=2m = -2 (slope)
  • b=5b = 5 (y-intercept)

To graph this:

  • The line passes through (0,5)(0, 5) on the y-axis.
  • The slope 2-2 means for every 1 unit moved to the right, the line moves down by 2 units.

Step 3: Finding the intersection point

Now, solving these equations algebraically to find the intersection (solution):

Set the two equations equal to each other: 23x3=2x+5\frac{2}{3}x - 3 = -2x + 5 To eliminate the fraction, multiply the entire equation by 3: 2x9=6x+152x - 9 = -6x + 15 Now, combine like terms: 2x+6x=15+92x + 6x = 15 + 9 8x=248x = 24 Solve for xx: x=3x = 3

Substitute x=3x = 3 back into one of the original equations (I'll use y=2x+5y = -2x + 5): y=2(3)+5=6+5=1y = -2(3) + 5 = -6 + 5 = -1

Thus, the solution is (3,1)(3, -1), meaning the two lines intersect at the point (3,1)(3, -1).

Matching with the graph:

From the graph, we observe that the lines intersect at approximately (3,1)(3, -1), confirming that the graph corresponds to this system of linear equations.

Would you like more details or have any questions?

Here are 5 questions related to this:

  1. How do you find the slope of a line from an equation?
  2. What is the graphical meaning of the slope in a linear equation?
  3. Can two lines have the same slope but different y-intercepts? What happens in this case?
  4. How do you solve a system of equations by substitution or elimination?
  5. What are the conditions for a system of linear equations to have no solution?

Tip: When graphing a linear equation, always start by plotting the y-intercept and then use the slope to plot additional points.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing Systems of Equations
Slope-Intercept Form

Formulas

y = mx + b (Slope-Intercept Form)
Solving Systems by Substitution or Elimination

Theorems

Slope-Intercept Theorem
Intersection of Lines in a System of Equations

Suitable Grade Level

Grades 8-10