Persmaan lianer dua variabel (x+3y=20 (x-4y=-22

x+3y=20
x-4y=-22
-
hasilnya 7y=42
y=6
nilai x
x+3y=20
x+3(6)=20
x+18=20
x=2

x + 3y = 20
x = 20 - 3y...(1)
substitusi (1) ke (2)
(2) x - 4y = -22
20 - 3y - 4y = -22
-7y = -42
y = 6
x + 3y = 20
x + 3(6) = 20
x = 20 - 18
x = 2