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penye :
x = 4 ( 4,0)
y = 4 ( 0,4)
4 ) 5x + 3y < 15
x = 0 y = 0
5x + 3y = 15 5x + 3 (0) = 15
5 (0) + 3y = 15 x = 3
y = 5 x = ( 3 , 0 )
y = ( 0 , 5 )
x = 0 y = 0
x + y = 15 = x + y = 15
0 + y = 15 = x + 0 = 15
y = 15 ( 0 , 15 ) =15 ( 15 , 0 )
Grafik no 4 ada dua garis ...
x = 5 ----- y = 15
x = 3 ------ y 15
saya hanya membuat 1 grafik