Question

-4x+5y = 2
-7x-8y=1.
Método cramer

Answer 1

Respuesta:

x= -21/67

y= 10/67

Explicación paso a paso:

$D=\left[\begin{array}{ccc}-4&5\\-7&-8&\\\end{array}\right] =(-4)(-8)-(-7)(5)=67$

$D1=\left[\begin{array}{ccc}2&5\\1&-8\\\end{array}\right] =(2(-8))-(1(5))=-21$

$D2=\left[\begin{array}{ccc}-4&2\\-7&1\\\end{array}\right] =-4+14=10$

x=D1/D= -21/67

y =D2/D= 10/67