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Question Find the solution of the system of equations. \[ \begin{array}{r}8 x-3 y=2 \\ -8 x-5 y=46\end{array} \] Answer Attempt 1 out of 2

Ask by Cook Johnston. in the United States
Mar 10,2025

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The solution to the system of equations is \( x = -2 \) and \( y = -6 \).

Solución

1. Write the system of equations: \[ \begin{aligned} 8x - 3y &= 2 \quad \text{(Equation 1)}\\ -8x - 5y &= 46 \quad \text{(Equation 2)} \end{aligned} \] 2. Add Equation 1 and Equation 2 to eliminate \(x\): \[ (8x - 3y) + (-8x - 5y) = 2 + 46 \] \[ 8x - 8x - 3y - 5y = 48 \] \[ -8y = 48 \] 3. Solve for \(y\): \[ y = \frac{48}{-8} = -6 \] 4. Substitute \(y = -6\) into Equation 1 to solve for \(x\): \[ 8x - 3(-6) = 2 \] \[ 8x + 18 = 2 \] \[ 8x = 2 - 18 = -16 \] \[ x = \frac{-16}{8} = -2 \] 5. The solution to the system is: \[ x = -2, \quad y = -6 \]

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Mind Expander

To solve the system of equations, we can start by isolating one of the variables. Let’s take the first equation \(8x - 3y = 2\) and express \(y\) in terms of \(x\): \[ 3y = 8x - 2 \implies y = \frac{8x - 2}{3} \] We can substitute this expression for \(y\) into the second equation \(-8x - 5y = 46\): \[ -8x - 5\left(\frac{8x - 2}{3}\right) = 46 \] Now, let's clear the fraction by multiplying through by 3: \[ -24x - 5(8x - 2) = 138 \] Expanding this gives: \[ -24x - 40x + 10 = 138 \implies -64x + 10 = 138 \] Then, isolate \(x\): \[ -64x = 138 - 10 \implies -64x = 128 \implies x = -2 \] Now, substitute \(x = -2\) back into the expression for \(y\): \[ y = \frac{8(-2) - 2}{3} = \frac{-16 - 2}{3} = \frac{-18}{3} = -6 \] Thus, the solution to the system of equations is \((x, y) = (-2, -6)\). 💡 Here's a fun bit for you: The method we used is often akin to “substitution magic”! It’s like solving a mystery where you find one clue (variable) that leads you to another, ultimately uncovering the hidden secret (solution)! And speaking of mysteries, real-life applications of linear systems like this pop up everywhere – from budgeting your finances to understanding supply and demand in markets! Companies rely on these equations to decide how much of a product to produce based on different factors. It's all in a day's work for most businesses!

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