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\( \begin{array}{l}40 \text { Listen } \\ \text { What is the solution to the system of equations? } \\ \begin{array}{l}3 x+5 y=-3 \\ 4 x+10 y=-14\end{array}\end{array} \)

Ask by Martinez Carroll. in the United States
Feb 03,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The solution is \( x = 4 \) and \( y = -3 \).

Solution

To solve the system of equations: \[ \begin{cases} 3x + 5y = -3 \\ 4x + 10y = -14 \end{cases} \] **Step 1: Elimination Method** 1. **Multiply the first equation by 2** to make the coefficients of \( y \) the same: \[ 2(3x + 5y) = 2(-3) \\ 6x + 10y = -6 \quad \text{(Equation 1a)} \] 2. **Write down the second equation as is:** \[ 4x + 10y = -14 \quad \text{(Equation 2)} \] 3. **Subtract Equation 2 from Equation 1a:** \[ (6x + 10y) - (4x + 10y) = -6 - (-14) \\ 2x = 8 \\ x = 4 \] **Step 2: Substitute \( x = 4 \) into the first original equation to find \( y \):** \[ 3(4) + 5y = -3 \\ 12 + 5y = -3 \\ 5y = -15 \\ y = -3 \] **Solution:** \[ x = 4 \\ y = -3 \] **Verification:** Plugging \( x = 4 \) and \( y = -3 \) into the second original equation: \[ 4(4) + 10(-3) = 16 - 30 = -14 \] Which matches the given equation, confirming that the solution is correct. **Final Answer:** The solution is \( x = 4 \) and \( y = -3 \).

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To find the solution to the system of equations, let's analyze the two equations given: 1. \(3x + 5y = -3\) 2. \(4x + 10y = -14\) Notice that the second equation can be simplified by dividing everything by 2, giving us \(2x + 5y = -7\). If we compare this with the first equation, we can multiply the first equation by 2: \(2(3x + 5y) = 2(-3)\) which simplifies to \(6x + 10y = -6\). Now we can see that both equations represent the same line when rearranged, which indicates that they are dependent. Therefore, the system has infinitely many solutions along this line. For any value of \(y\), we can derive a corresponding \(x\) using \(x = \frac{-3 - 5y}{3}\). So, the solution set can be expressed as \((x, y) = \left(\frac{-3 - 5y}{3}, y\right)\) for any real number \(y\).

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