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x | 0 | 1
y | -1| 3
(x,y)|(0,-1)| (1,3)
tinggal gambar grafiknya gambar sendiri
x l 0 l 4
y l -1 l 0
x,y = 0,1 dan 4,0
b. x = 2y-2
x l 0 l -2
y l 2 l 0
x,y = 0,2 dan -2,0