Pregunta
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S start a new one today. \[ \begin{array}{l}-3 x+3 y=9 \\ \text { Estimate the solution to the system of equations. } \\ \text { You can use the interactive graph below to find the solution. } \\ 2 x-7 y=-14 \\ \text { Choose } 1 \text { answer: } \\ \text { (A) } x=-1 \frac{2}{5}, y=1 \frac{3}{5} \\ \text { (B) } x=-2 \frac{2}{5}, y=1 \frac{3}{5} \\ \text { (C) } x=-1 \frac{2}{5}, y=2 \frac{3}{5} \\ \text { (D) } x=-2 \frac{2}{5}, y=2 \frac{3}{5}\end{array} \]

Ask by Joseph Bush. in the United States
Jan 10,2025

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The solution is \( x = -1 \frac{2}{5} \) and \( y = 1 \frac{3}{5} \), so the correct answer is (A).

Solución

Let's solve the system of equations to find the solution: \[ \begin{cases} -3x + 3y = 9 \\ 2x - 7y = -14 \end{cases} \] **Step 1: Simplify the first equation.** Divide the first equation by 3: \[ -3x + 3y = 9 \quad \Rightarrow \quad -x + y = 3 \quad \Rightarrow \quad y = x + 3 \] **Step 2: Substitute \( y \) from the first equation into the second equation.** Replace \( y \) with \( x + 3 \) in the second equation: \[ 2x - 7(x + 3) = -14 \] **Step 3: Solve for \( x \).** \[ 2x - 7x - 21 = -14 \] \[ -5x - 21 = -14 \] \[ -5x = 7 \] \[ x = -\frac{7}{5} = -1 \frac{2}{5} \] **Step 4: Find \( y \) using the value of \( x \).** \[ y = x + 3 = -\frac{7}{5} + \frac{15}{5} = \frac{8}{5} = 1 \frac{3}{5} \] **Conclusion:** The solution to the system of equations is: \[ x = -1 \frac{2}{5}, \quad y = 1 \frac{3}{5} \] **Therefore, the correct answer is:** **(A) \( x = -1 \frac{2}{5},\ y = 1 \frac{3}{5} \)**

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Bonus Knowledge

To estimate the solution to the system of equations, you can graph the lines represented by each equation. By determining where the two lines intersect, you find the values of \(x\) and \(y\) that satisfy both equations. If you plot the first equation \( -3x + 3y = 9 \), you can convert it to slope-intercept form \( y = x + 3 \). The second equation \( 2x - 7y = -14 \) can be rearranged to \( y = \frac{2}{7}x + 2 \). The intersection point is the estimated solution. Once you have the graphical solution, you can check which answer matches the coordinates of the intersection. After plotting the lines, if the intersection appears around \( (-2.4, 2.6) \), then option (D) \( x = -2 \frac{2}{5}, y = 2 \frac{3}{5} \) would be the closest match!

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