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Question Find the solution of the system of equations. \[ \begin{array}{r}6 x+2 y=16 \\ 2 x-2 y=32\end{array} \] Answer Attempt 1 out of 2

Ask by Chadwick Mathis. in the United States
Mar 10,2025

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The solution is \( x = 6 \) and \( y = -10 \).

Solución

Solve the system of equations \( 6x+2y=16;2x-2y=32 \). Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}6x+2y=16\\2x-2y=32\end{array}\right.\) - step1: Solve the equation: \(\left\{ \begin{array}{l}x=\frac{8-y}{3}\\2x-2y=32\end{array}\right.\) - step2: Substitute the value of \(x:\) \(2\times \frac{8-y}{3}-2y=32\) - step3: Simplify: \(\frac{2\left(8-y\right)}{3}-2y=32\) - step4: Multiply both sides of the equation by LCD: \(\left(\frac{2\left(8-y\right)}{3}-2y\right)\times 3=32\times 3\) - step5: Simplify the equation: \(16-8y=96\) - step6: Move the constant to the right side: \(-8y=96-16\) - step7: Subtract the numbers: \(-8y=80\) - step8: Change the signs: \(8y=-80\) - step9: Divide both sides: \(\frac{8y}{8}=\frac{-80}{8}\) - step10: Divide the numbers: \(y=-10\) - step11: Substitute the value of \(y:\) \(x=\frac{8-\left(-10\right)}{3}\) - step12: Substitute back: \(x=\frac{8+10}{3}\) - step13: Calculate: \(x=6\) - step14: Calculate: \(\left\{ \begin{array}{l}x=6\\y=-10\end{array}\right.\) - step15: Check the solution: \(\left\{ \begin{array}{l}x=6\\y=-10\end{array}\right.\) - step16: Rewrite: \(\left(x,y\right) = \left(6,-10\right)\) The solution to the system of equations is \( (x, y) = (6, -10) \).

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Bonus Knowledge

To solve the system of equations, let's start by simplifying the second equation. Divide the entire equation \(2x - 2y = 32\) by 2: \[ x - y = 16 \quad \text{(Equation 2')} \] Now, we can use substitution or elimination. From Equation 2', we can express \(y\) in terms of \(x\): \[ y = x - 16 \] Substituting this into the first equation \(6x + 2y = 16\): \[ 6x + 2(x - 16) = 16 \] Simplifying: \[ 6x + 2x - 32 = 16 \] \[ 8x - 32 = 16 \] \[ 8x = 48 \] So, \[ x = 6 \] Now, substitute \(x = 6\) back into \(y = x - 16\): \[ y = 6 - 16 = -10 \] Thus, the solution of the system of equations is \(x = 6\) and \(y = -10\). To check your work, always plug your solution back into both original equations to ensure they hold true!

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