sistem persamaan x-3y=4 x-9y=5

x - 3y = 4
x - 9y = 5
_________-
6y = -1
y = -1/6

x - 3y = 4
x - 3(-1/6) = 4
x + 3/6 =4
x = 24/6 - 3/6
x = 21/6