Math Problem Statement

The line graphed on the grid represents the first of two equations in a system of linear equations.

If the graph of the second equation in the system passes through the points (−12,20) and (4,12) , which statement is true? A.The only solution to the system is (0,14) . B.The system has an infinite number of solutions. C.The system has no solution. D.The only solution to the system is (10,5) .

Solution

To determine the correct statement about the system of equations, we need to analyze the line formed by the two points given for the second equation: (12,20)(-12, 20) and (4,12)(4, 12).

  1. Calculate the slope (m) of the line connecting these points: m=y2y1x2x1=12204(12)=816=12m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{12 - 20}{4 - (-12)} = \frac{-8}{16} = -\frac{1}{2}

  2. Use the point-slope form to write the equation of the line: yy1=m(xx1)y - y_1 = m(x - x_1) Using point (4,12)(4, 12): y12=12(x4)y - 12 = -\frac{1}{2}(x - 4) Simplifying: y12=12x+2    y=12x+14y - 12 = -\frac{1}{2}x + 2 \implies y = -\frac{1}{2}x + 14

  3. Examine the first line (represented by the graph). We need to check its slope and y-intercept to see if the lines are parallel, coincident, or intersecting.

  4. Analysis:

    • If the slopes are the same and the y-intercepts are different, the system has no solution (the lines are parallel).
    • If the slopes are different, there will be exactly one solution (the lines intersect).
    • If the slopes and y-intercepts are the same, there are infinite solutions (the lines are coincident).

Conclusion:

  • Without the graph of the first equation, we cannot definitively determine the relationship between the two lines.
  • However, if you check the slopes and the intercepts, you can conclude which statement is true.

From the options:

  • A: (0, 14) could be a solution if it lies on both lines.
  • B: Infinite solutions occur if both equations represent the same line.
  • C: No solution if the lines are parallel.
  • D: (10, 5) could also be a solution depending on the first line.

To decide: Check the first equation's slope and intercept against 12x+14-\frac{1}{2}x + 14.

Do you have the equation for the first line, or can you provide more details about the graph?

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope-Intercept Form
Systems of Equations

Formulas

Slope formula m = (y2 - y1) / (x2 - x1)
Point-slope form y - y1 = m(x - x1)

Theorems

Parallel lines have equal slopes
Intersecting lines have different slopes
Coincident lines are the same line

Suitable Grade Level

Grades 7-9