Math Problem Statement

Solve the system of equations by graphing: 2x - y = 5, x + 2y = 10

Solution

To solve the system of equations by graphing, we need to handle the given equations:

  1. 2xy=52x - y = 5
  2. x+2y=10x + 2y = 10

Steps:

  1. Rewrite each equation in slope-intercept form (y=mx+by = mx + b):

    • For 2xy=52x - y = 5: y=2x+5    y=2x5-y = -2x + 5 \implies y = 2x - 5

    • For x+2y=10x + 2y = 10: 2y=x+10    y=12x+52y = -x + 10 \implies y = -\frac{1}{2}x + 5

  2. Graph these equations:

    • y=2x5y = 2x - 5 has:

      • Slope m=2m = 2
      • Y-intercept b=5b = -5
    • y=12x+5y = -\frac{1}{2}x + 5 has:

      • Slope m=12m = -\frac{1}{2}
      • Y-intercept b=5b = 5
  3. Find the point of intersection:

    • From the equations, set 2x5=12x+52x - 5 = -\frac{1}{2}x + 5.
    • Combine terms: 2x+12x=10    52x=10    x=42x + \frac{1}{2}x = 10 \implies \frac{5}{2}x = 10 \implies x = 4
    • Substitute x=4x = 4 into one of the equations, e.g., y=2x5y = 2x - 5: y=2(4)5=85=3y = 2(4) - 5 = 8 - 5 = 3

    So, the solution is (4,3)(4, 3).

  4. Answer:

    • The solution is (4,3)\mathbf{(4, 3)}.
    • This corresponds to option AA.

Would you like more details or help understanding any of these steps?


Related Questions:

  1. What are the steps to rewrite equations in slope-intercept form?
  2. How do you identify the slope and y-intercept of a linear equation?
  3. What happens when two lines have the same slope but different intercepts?
  4. How do you verify a solution to a system of equations graphically and algebraically?
  5. Can a system of equations have no solution or infinitely many solutions? How can you tell?

Tip:

When graphing, always double-check the slope and intercept values to ensure accuracy in plotting.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
Slope-Intercept Form
Systems of Equations

Formulas

y = mx + b
2x - y = 5
x + 2y = 10

Theorems

Intersection of Linear Equations

Suitable Grade Level

Grades 7-9