Math Problem Statement

Solve the system of equations graphically: y = 2x - 5 and y = -x + 1.

Solution

The system of equations given in the image is:

  1. y=2x5y = 2x - 5
  2. y=x+1y = -x + 1

You are asked to solve this system graphically. To do this, let's find the points where the two lines intersect.

Step 1: Graph the first equation y=2x5y = 2x - 5

This is a straight line with:

  • Slope m=2m = 2 (meaning it rises 2 units for every 1 unit increase in xx).
  • Y-intercept at (0,5)(0, -5).

You can plot this line by starting at (0,5)(0, -5) and using the slope to move up 2 units and 1 unit to the right to plot additional points.

Step 2: Graph the second equation y=x+1y = -x + 1

This is also a straight line with:

  • Slope m=1m = -1 (meaning it falls 1 unit for every 1 unit increase in xx).
  • Y-intercept at (0,1)(0, 1).

Plot this line starting at (0,1)(0, 1) and moving down 1 unit and 1 unit to the right to mark more points.

Step 3: Find the Intersection Point

The intersection of these two lines gives the solution to the system of equations. Solving algebraically:

Set 2x5=x+12x - 5 = -x + 1.

2x+x=1+52x + x = 1 + 5 3x=6x=23x = 6 \quad \Rightarrow \quad x = 2

Substitute x=2x = 2 into one of the original equations, say y=2x5y = 2x - 5:

y=2(2)5=45=1y = 2(2) - 5 = 4 - 5 = -1

Thus, the solution is x=2x = 2, y=1y = -1. The lines intersect at the point (2,1)(2, -1).

Do you want more details or have any further questions? Here are some related questions to deepen your understanding:

  1. How can you verify if the solution (2,1)(2, -1) satisfies both equations?
  2. What happens if two lines are parallel in a system of equations? How is the solution affected?
  3. Can you solve this system using substitution or elimination, and how does the solution compare?
  4. What does the slope of a line tell you about how it behaves on a graph?
  5. How would the graph look if the lines were perpendicular?

Tip: When graphing lines, always pay attention to the slope and y-intercept, as they determine the position and steepness of the line.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
Algebra

Formulas

y = mx + b
System of equations

Theorems

Intersection of two lines

Suitable Grade Level

Grades 8-10