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jika x= 0, maka 2(0)-y=4
0-y=4
-y=4
y=-4 (0.4)
jika y= 0, maka 2x-0 =4
2x = 4
x = 2 (2,0)
x+y = 2
jika x= 0, maka 0+y = 2
y = 2 (0,2)
jika y= 0,maka x+0 =2
x = 2 (2,0)