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# I need some help with this problem

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Find the ordered pair$$(x,y)$$ that satisfies the system of equations

\begin{align*} x+3y &= -4,\\ 3x -7y &= 36. \end{align*}

Jun 30, 2022

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We can express the system in matrix form:

$$\begin{pmatrix} 1 & 3 \\ 3 & -7 \end{pmatrix} \begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix} -4 \\ 36 \end{pmatrix}$$

Inverting, we get x = 17/4 and y = -11/4, so the solution is (17/4, -11/4).

Jun 30, 2022