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y = mx + c ; m = gradien
1.) benar, karena: y = 3x - 2 --> m = 3
2.) benar, karena: y = 3 -2x --> y = -2x + 3 --> m = -2
3.) salah, karena: y = -5x + 5 --> m = -5, bukan 5
4.) benar, karena: y = -3 -3x = -3x - 3 --> m =-3