Question
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Determine if the following system of equations has no solutions, infinitely many solutions or exactly one solution. \[ \begin{array}{l}-x+2 y=-7 \\ -4 x+8 y=-28\end{array} \] Answer Infinitely Many Solutions No Solutions One Solution

Ask by Daniels Dickson. in the United States
Jan 22,2025

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Answer

There are infinitely many solutions to the system of equations.

Solution

The given system of equations is: \[ \begin{cases} -x + 2y = -7 \quad \text{(Equation 1)} \\ -4x + 8y = -28 \quad \text{(Equation 2)} \end{cases} \] To determine the nature of the solutions, let's analyze the equations: 1. **Check for Proportionality:** Multiply **Equation 1** by 4: \[ 4(-x) + 4(2y) = 4(-7) \\ -4x + 8y = -28 \] This result is identical to **Equation 2**: \[ -4x + 8y = -28 \] 2. **Interpretation:** Since **Equation 2** is just a multiple of **Equation 1**, both equations represent the same line in the plane. Therefore, every solution that satisfies one equation will also satisfy the other. **Conclusion:** There are infinitely many solutions to the system. **Answer:** Infinitely Many Solutions

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Beyond the Answer

To analyze the system of equations, we'll first simplify the second equation: The second equation \(-4x + 8y = -28\) can be simplified by dividing every term by -4, giving us: \[ x - 2y = 7 \] Now, we can rewrite this in a standard form: \[ x - 2y = 7 \] Now we can compare this with the first equation which is already in standard form: \[ -x + 2y = -7 \] If we multiply the first equation by -1, we get: \[ x - 2y = 7 \] Both equations are essentially the same, meaning they represent the same line. Therefore, the system has infinitely many solutions, as any point on this line will satisfy both equations. For a visual twist, imagine these lines as two dancers spinning on stage, with each one following the other's steps perfectly. Since they never miss a beat, they end up dancing together for all time, illustrating the infinitely many solutions! As a little tip, when faced with such systems, always check if you can simplify the equations first, and remember that identical equations signal a dance of infinite possibilities! Just watch out; if the two equations were parallel but not the same, that would point to two dancers who can’t quite sync up—no solution there!

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