Math Problem Statement

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Solution

The image shows a graph with two intersecting lines, and the problem asks for the correct solution based on the graph. The graph contains an xx-axis and a yy-axis with labeled points, and the two lines intersect near the point (2,7)(2, 7).

Step-by-Step Analysis:

  1. The graph shows two lines:
    • One with a positive slope crossing through (0,7)(0, 7) and (2,0)(2, 0).
    • The other with a negative slope crossing through (0,5)(0, -5) and intersecting at (2,0)(2, 0).

Interpretation:

The problem likely asks for the equations of the two lines or the point where they intersect.

Line 1:

This line appears to pass through (0,7)(0, 7) (the y-intercept) and (2,0)(2, 0). Using the slope formula: m=y2y1x2x1=0720=72m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{0 - 7}{2 - 0} = \frac{-7}{2} The equation of the line using the slope-intercept form y=mx+by = mx + b is: y=72x+7y = -\frac{7}{2}x + 7

Line 2:

This line passes through (0,5)(0, -5) (the y-intercept) and intersects (2,0)(2, 0). Calculating the slope: m=0(5)20=52m = \frac{0 - (-5)}{2 - 0} = \frac{5}{2} The equation of this line is: y=52x5y = \frac{5}{2}x - 5

Solution:

From the graph, it seems that the solution is the point of intersection of these two lines. To find the intersection point, solve the system of equations: 72x+7=52x5-\frac{7}{2}x + 7 = \frac{5}{2}x - 5 Solve for xx: 72x52x=57-\frac{7}{2}x - \frac{5}{2}x = -5 - 7 122x=126x=12x=2-\frac{12}{2}x = -12 \quad \Rightarrow \quad -6x = -12 \quad \Rightarrow \quad x = 2

Now substitute x=2x = 2 into one of the equations (e.g., y=72x+7y = -\frac{7}{2}x + 7): y=72(2)+7=7+7=0y = -\frac{7}{2}(2) + 7 = -7 + 7 = 0 Thus, the intersection point is (2,0)(2, 0).

The correct solution is the intersection point (2,0)(2, 0).

Would you like more details or clarifications on this?

Here are 5 related questions to expand on this topic:

  1. What is the general method for finding the intersection of two lines algebraically?
  2. How do you graph a linear equation using its slope and y-intercept?
  3. Can two lines have more than one point of intersection? Why or why not?
  4. What does the slope of a line tell you about its steepness and direction?
  5. How do parallel and perpendicular lines behave in terms of their slopes?

Tip: When graphing lines, always find the y-intercept and slope to quickly draw the line and determine key points.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Slope-intercept form: y = mx + b
Solving systems of equations

Theorems

Intersection of two lines theorem

Suitable Grade Level

Grades 8-10