Question

Determine X e Y reais, tais que:​

Answer 1

Resposta:  

X= 2

Y= -4

Explicação passo-a-passo:

$\left[\begin{array}{ccc}2&x\\y&-3\end{array}\right] .\left[\begin{array}{ccc}4\\-5\end{array}\right] =\left[\begin{array}{ccc}-2\\-1\end{array}\right] \\\\\\\\\left[\begin{array}{ccc}2.4 +x.(-5)\\y.4+(-3).(-5)\\\end{array}\right] = \left[\begin{array}{ccc}-2\\-1\end{array}\right] \\\\\\\left[\begin{array}{ccc}8&-5x&\\4y&15\\\end{array}\right] =\left[\begin{array}{ccc}-2\\-1\end{array}\right] \\\\8 - 5x= -2\\5x = 8 +2\\5x = 10\\x= \frac{10}{5} \\\\----> X= 2 <------$

4y + 15 = -1

4y = -15 -1

4y= -16

y= -16/4

------->  y= -4    <---------

Espero ter ajudado, bons estudos :))