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x = 2
subtitusi x ke persamaan x + 3y = 11, maka
x + 3y = 11
(2) + 3y = 11
2 + 3y - 2 = 11 - 2 -> kedua ruas diberi perlakuan yang sama, yaitu - 2
3y + 2 - 2 = 11 - 2
3y = 9
y = 9/3
y = 3
Maka, (x,y) = (2,3)
2. sama dengan cara nomor 1