Respuesta:
x= -21/67
y= 10/67
Explicación paso a paso:
[tex]D=\left[\begin{array}{ccc}-4&5\\-7&-8&\\\end{array}\right] =(-4)(-8)-(-7)(5)=67[/tex]
[tex]D1=\left[\begin{array}{ccc}2&5\\1&-8\\\end{array}\right] =(2(-8))-(1(5))=-21[/tex]
[tex]D2=\left[\begin{array}{ccc}-4&2\\-7&1\\\end{array}\right] =-4+14=10[/tex]
x=D1/D= -21/67
y =D2/D= 10/67
