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y = mx + c
Untuk (3,20)
20 = 3m + c
Untuk (4,23)
23 = 4m + c
Sehingga,
Dengan metode eliminasi:
4m + c = 23
3m + c = 20
- - Kurangi - -
m = 3
Dan, substitusi untuk c,
20 = 3m + c
20 = 3(3) + c
20 = 9 + c
c = 11
Sehingga,
m = 3 dan c = 11