Question

Utilizando o método de Cramer, determine a solução dos sistemas a seguir.

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Answer 1

$D=\left[\begin{array}{ccc}3&4\\5&7\\\end{array}\right] =21-20=1\\\\Dx=\left[\begin{array}{ccc}8&4\\13&7\\\end{array}\right]=56-52=4\\\\Dy=\left[\begin{array}{ccc}3&8\\5&13\\\end{array}\right]=39-40=-1\\\\x=\frac{Dx}{D}=4\\ y=\frac{Dy}{D} =-1$

$D=\left[\begin{array}{ccc}3&2\\5&4\\\end{array}\right] = 12-10=2\\\\Dx=\left[\begin{array}{ccc}9&2\\14&4\\\end{array}\right] =36-28=8\\\\Dy=\left[\begin{array}{ccc}3&9\\5&14\\\end{array}\right] =42-45=-3\\\\x=\frac{Dx}{D} =4\\y=\frac{Dy}{D} =\frac{-3}{2}$