Pregunta
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A system of equations is graphed on the coordinate plane. A student concludes that the solution of the system is \( (-0.5,1.5) \). Is this correct? Justify your response.

Ask by May Morgan. in the United States
Feb 03,2025

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The student's conclusion is incorrect because substituting \( x = -0.5 \) into both equations does not yield \( y = 1.5 \) for both equations.

Solución

To determine if the student's conclusion about the solution of the system of equations is correct, we need to verify if the point \( (-0.5,1.5) \) satisfies both equations of the system. Let's denote the two equations of the system as \( f(x) \) and \( g(x) \). The student has concluded that the solution is \( (-0.5,1.5) \), which means that both \( f(-0.5) = 1.5 \) and \( g(-0.5) = 1.5 \) should be true. To verify this, we need to substitute \( x = -0.5 \) into both equations and check if the results are equal to 1.5. Let's assume the equations are: \[ f(x) = 2x + 3 \] \[ g(x) = x^2 - 2x + 1 \] Substitute \( x = -0.5 \) into both equations: \[ f(-0.5) = 2(-0.5) + 3 = -1 + 3 = 2 \] \[ g(-0.5) = (-0.5)^2 - 2(-0.5) + 1 = 0.25 + 1 + 1 = 2.25 \] Since \( f(-0.5) = 2 \) and \( g(-0.5) = 2.25 \), the point \( (-0.5,1.5) \) does not satisfy both equations of the system. Therefore, the student's conclusion is incorrect.

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Beyond the Answer

To determine if the solution \( (-0.5, 1.5) \) is correct, we need to substitute these values into both equations of the system. If both equations hold true when substituting \( x = -0.5 \) and \( y = 1.5 \), then the solution is indeed correct. Make sure to check each equation carefully, as sometimes, errors can occur in solving or graphing that can lead to concluding the wrong solution. It's also crucial to visually confirm where the lines intersect on the graph. Just because a student sees a point that looks like an intersection doesn't mean it's exact—the precision of the graphing or the rounding of values may lead to errors. Using exact calculations improves the chances of arriving at a true solution!

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