Use Matrices to Solve the System of Equations (If Possible) $$\left\{ \begin{aligned}7 x - 6 y & = - 40 \\- 5 x + 7 y & = 34\end{aligned} \right.$$

question 122

Multiple Choice

Use matrices to solve the system of equations (if possible) .Use Gaussian elimination with back-substitution or Gauss-Jordan elimination. $$\left\{ \begin{aligned}7 x - 6 y & = - 40 \\- 5 x + 7 y & = 34\end{aligned} \right.$$

• A)x = 4, y = -2
• B)x = -4, y = 2
• C)x = 2, y = -4
• D)x = 2, y = 4
• E)no solution

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