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Solve the system by the elimination/addition method \( -3 x-4 y=-13 \) \( -1 x+5 y=2 \)

Ask by Savage Lewis. in the United States
Mar 20,2025

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Answer

The solution is \( x=3 \) and \( y=1 \).

Solution

Solve the system of equations \( -3x-4y=-13;-x+5y=2 \). Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}-3x-4y=-13\\-x+5y=2\end{array}\right.\) - step1: Solve the equation: \(\left\{ \begin{array}{l}-3x-4y=-13\\x=-2+5y\end{array}\right.\) - step2: Substitute the value of \(x:\) \(-3\left(-2+5y\right)-4y=-13\) - step3: Simplify: \(6-19y=-13\) - step4: Move the constant to the right side: \(-19y=-13-6\) - step5: Subtract the numbers: \(-19y=-19\) - step6: Change the signs: \(19y=19\) - step7: Divide both sides: \(\frac{19y}{19}=\frac{19}{19}\) - step8: Divide the numbers: \(y=1\) - step9: Substitute the value of \(y:\) \(x=-2+5\times 1\) - step10: Substitute back: \(x=-2+5\) - step11: Calculate: \(x=3\) - step12: Calculate: \(\left\{ \begin{array}{l}x=3\\y=1\end{array}\right.\) - step13: Check the solution: \(\left\{ \begin{array}{l}x=3\\y=1\end{array}\right.\) - step14: Rewrite: \(\left(x,y\right) = \left(3,1\right)\) The solution to the system of equations by the elimination/addition method is \( (x,y) = (3,1) \).

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To solve the system using the elimination method, we can first multiply the second equation by 3 to align the coefficients of \(x\): 1. First equation: \(-3x - 4y = -13\) 2. Second equation (after multiplying by 3): \(-3x + 15y = 6\) Now, our system of equations looks like this: \[ -3x - 4y = -13 \quad (1) \] \[ -3x + 15y = 6 \quad (2) \] Next, we can subtract equation (1) from equation (2) to eliminate \(x\): \[ (-3x + 15y) - (-3x - 4y) = 6 - (-13) \] This simplifies to: \[ 15y + 4y = 6 + 13 \] \[ 19y = 19 \] \[ y = 1 \] Now that we have \(y\), we can substitute \(y = 1\) back into the original second equation to find \(x\): \(-1x + 5(1) = 2\) This simplifies to: \(-x + 5 = 2\) Solving for \(x\): \(-x = 2 - 5\) \(-x = -3\) \(x = 3\) Thus, the solution to the system of equations is \(x = 3\) and \(y = 1\). Therefore, the solution is: \((x, y) = (3, 1)\).

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