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x = 6 - y
2x + y = 11
2(6 - y) + y = 11
12 - 2y + y = 11
-2y + y = 11 - 12
-y = -1
y = 1
x + y = 6
x + 1 = 6
x = 6 - 1
x = 5
Himpunan penyelesaian = {x, y} = {5, 1}
2x+y. =11
kurangkan!
y=1,,masukkan nilai y ke persamaan x+y=6...x+1=5,x=5-1=4
(4,1)