What can you determine about the solution(s) of the following system of equations? -64x + 96y = 176 56x - 84y = -147

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Understand the Problem

The question asks us to analyze the given system of two linear equations and determine the nature of its solution(s). We need to figure out if the system has a unique solution, infinitely many solutions, or no solution.

Answer

The system has no solution.
Answer for screen readers

The system has no solution.

Steps to Solve

  1. Check if the equations are multiples of each other

To determine if the system has a unique solution, no solution, or infinitely many solutions, we can check the ratios of the coefficients of $x$ and $y$, and the constants.

  1. Find the ratio of the coefficients of x

The ratio of the coefficients of $x$ is: $$ \frac{-64}{56} = -\frac{8}{7} $$

  1. Find the ratio of the coefficients of y

The ratio of the coefficients of $y$ is: $$ \frac{96}{-84} = -\frac{24}{21} = -\frac{8}{7} $$

  1. Find the ratio of the constants

The ratio of the constants is: $$ \frac{176}{-147} $$ Since $176 = 16 \times 11$ and $147 = 3 \times 49 = 3 \times 7^2$, there is no common factor to simplify the fraction.

  1. Compare the Ratios

We see that the ratios of the coefficients of $x$ and $y$ are equal, i.e., $$ \frac{-64}{56} = \frac{96}{-84} = -\frac{8}{7} $$ However, the ratio of the constants is different. $$ \frac{176}{-147} \neq -\frac{8}{7} $$

  1. Conclusion

Since the ratios of the coefficients of $x$ and $y$ are equal, but the ratio of the constants is different, the system has no solution. The two lines are parallel and distinct.

The system has no solution.

More Information

When the ratios of the coefficients of $x$ and $y$ are equal but not equal to the ratio of the constants, it means the two lines represented by the equations are parallel but do not coincide. Therefore, they never intersect, indicating that there is no solution to the system of equations.

Tips

A common mistake is to stop after finding that the ratios of the coefficients of $x$ and $y$ are equal and conclude that the system has infinitely many solutions without checking the ratio of the constants. Remember to always compare all three ratios (coefficients of $x$, coefficients of $y$, and the constants) to determine the correct nature of the solution(s).

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