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y = 2x - 4
untuk x = 1 -----> y = 2.(1) - 4
= 2 - 4
= - 2
untuk x = 2 ------> y = 2(2) - 4
= 4 - 4
= 0
untuk x = 3 ------> y = 2.(3) - 4
= 6 - 4
= 2
untuk x = 4 ------> y = 2.(4) - 4
= 8 - 4
= 4
lihat diagram di bawah.....