{-x-6y = - 20
{-4x+y = - 5
{x = 20-6y
{-4x+y = -5
-4(20-6y) = -5
-80+24y+y = -5
-80+25y = -5
25y = -5+80
25y = 75
y = 3
(x,y) = (2,3)
