Pregunta
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\( 7 x-3 y=41 \) and \( 3 x-y=17 \)

Ask by Blake Osborne. in South Africa
Feb 26,2025

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\( x=5 \) and \( y=-2 \).

Solución

Solve the system of equations \( 7x-3y=41;3x-y=17 \). Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}7x-3y=41\\3x-y=17\end{array}\right.\) - step1: Solve the equation: \(\left\{ \begin{array}{l}7x-3y=41\\y=-17+3x\end{array}\right.\) - step2: Substitute the value of \(y:\) \(7x-3\left(-17+3x\right)=41\) - step3: Simplify: \(-2x+51=41\) - step4: Move the constant to the right side: \(-2x=41-51\) - step5: Subtract the numbers: \(-2x=-10\) - step6: Change the signs: \(2x=10\) - step7: Divide both sides: \(\frac{2x}{2}=\frac{10}{2}\) - step8: Divide the numbers: \(x=5\) - step9: Substitute the value of \(x:\) \(y=-17+3\times 5\) - step10: Calculate: \(y=-2\) - step11: Calculate: \(\left\{ \begin{array}{l}x=5\\y=-2\end{array}\right.\) - step12: Check the solution: \(\left\{ \begin{array}{l}x=5\\y=-2\end{array}\right.\) - step13: Rewrite: \(\left(x,y\right) = \left(5,-2\right)\) The solution to the system of equations \(7x-3y=41\) and \(3x-y=17\) is \(x=5\) and \(y=-2\).

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The Deep Dive

To tackle the equations \( 7x - 3y = 41 \) and \( 3x - y = 17 \), let's dive into a classic method: substitution or elimination. With elimination, you can align the equations or manipulate them to eliminate one variable. For instance, you could multiply the second equation by 3 to align the \( y \) terms and then combine both equations to solve for \( x \) first. Once you find \( x \), substitute it back into either original equation to find \( y \). It’s a great way to see how system equations can intersect in a way that gives you distinct values—like finding the perfect point on a treasure map! Keep an eye out for simple mistakes like miscalculating or losing signs; double-checking your work can save you from headaches later on! For a deeper understanding, consider exploring similar linear equation problems and methods like graphing or matrix approaches. Dive into algebra textbooks or online platforms that focus on systems of equations as they often have a multitude of practice problems and visual aids that instantly make the concepts clearer and more enjoyable!

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