Math Problem Statement

Solve the following system of equations graphically: y = -x + 1, x - 2y = 4.

Solution

The system of equations provided is:

y=x+1y = -x + 1 x2y=4x - 2y = 4

To solve this graphically, you need to graph both equations on the coordinate plane and identify where they intersect.

Steps:

  1. First Equation: y=x+1y = -x + 1

    • This is already in slope-intercept form y=mx+by = mx + b, where m=1m = -1 (slope) and b=1b = 1 (y-intercept).
    • To graph: Start at (0,1)(0, 1) on the y-axis, and use the slope of -1 (down 1 unit, right 1 unit) to plot additional points.
  2. Second Equation: x2y=4x - 2y = 4

    • Rearrange this into slope-intercept form y=mx+by = mx + b: x2y=42y=x+4y=12x2x - 2y = 4 \quad \Rightarrow \quad -2y = -x + 4 \quad \Rightarrow \quad y = \frac{1}{2}x - 2
    • Now, the slope is 12\frac{1}{2} and the y-intercept is 2-2.
    • To graph: Start at (0,2)(0, -2) on the y-axis, and use the slope 12\frac{1}{2} (up 1 unit, right 2 units) to plot additional points.

Intersection Point:

The solution to the system of equations is where the two lines intersect on the graph.

Would you like me to generate a visual graph of these equations or guide you further with the graphing?

Also, here are some related questions to explore:

  1. How do you solve a system of equations algebraically?
  2. What does the slope represent in a linear equation?
  3. How does the graphical method compare to substitution or elimination methods?
  4. What happens if the lines are parallel?
  5. How do you identify the slope and y-intercept from any linear equation?

Tip: Always check if the system is consistent (intersects at a point), inconsistent (parallel), or dependent (same line) when solving graphically.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
System of Equations

Formulas

Slope-intercept form y = mx + b

Theorems

Intersection of lines

Suitable Grade Level

Grades 8-10