Question

Calcule o valor de 2x-t no sistema 3x+y=1 x+3y=-5

Answer 1

x+3y=-5
 3x+y=1   x(-3)
x+3y=-5
-9x-3y= -3
-8x= -8 
x= -8/-8
x= 1
3.1+y=1
y=1-3
y= -2