Question
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\( y-3 x=-2 \) and \( 7 x-2 y=8 \)

Ask by Frank Ruiz. in South Africa
Feb 26,2025

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Tutor-Verified Answer

Answer

\( x=4 \) and \( y=10 \).

Solution

Solve the system of equations \( y-3x=-2;7x-2y=8 \). Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}y-3x=-2\\7x-2y=8\end{array}\right.\) - step1: Solve the equation: \(\left\{ \begin{array}{l}y=-2+3x\\7x-2y=8\end{array}\right.\) - step2: Substitute the value of \(y:\) \(7x-2\left(-2+3x\right)=8\) - step3: Simplify: \(x+4=8\) - step4: Move the constant to the right side: \(x=8-4\) - step5: Subtract the numbers: \(x=4\) - step6: Substitute the value of \(x:\) \(y=-2+3\times 4\) - step7: Calculate: \(y=10\) - step8: Calculate: \(\left\{ \begin{array}{l}x=4\\y=10\end{array}\right.\) - step9: Check the solution: \(\left\{ \begin{array}{l}x=4\\y=10\end{array}\right.\) - step10: Rewrite: \(\left(x,y\right) = \left(4,10\right)\) The solution to the system of equations \(y-3x=-2\) and \(7x-2y=8\) is \(x=4\) and \(y=10\).

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Beyond the Answer

To solve the system of equations, we can express \(y\) in terms of \(x\) from the first equation: From \(y - 3x = -2\), we have: \[ y = 3x - 2 \] Now, substitute \(y\) in the second equation \(7x - 2y = 8\): \[ 7x - 2(3x - 2) = 8 \] This simplifies to: \[ 7x - 6x + 4 = 8 \] \[ x + 4 = 8 \] \[ x = 4 \] Now, plug \(x\) back into the equation for \(y\): \[ y = 3(4) - 2 = 12 - 2 = 10 \] So the solution to the system is \(x = 4\) and \(y = 10\). By graphing this set of equations, you'll notice their intersection at point (4, 10). This visual representation can be a great way to understand how systems of equations work, especially when you're learning to solve them. The lines you graph illustrate the relationships and allow for a clear understanding of their solutions!

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