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jika nilai x = 0 maka nilai y
x + 2y = 12
2y = 12
y = 12/2
y = 6
jika nilai y = 0 maka nilai x
x + 2y = 12
x = 12
2x - 3y ≥ -6
jika nilai x = 0 maka nilai y
2x - 3y = -6
-3y = -6
y = 2
jika nilai y = 0 maka nilai x
2x - 3y = -6
2x = -6
x = 3
batas gari salin adalah
x ≥ 0 dan y ≥ 0