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(- 4, 2) ⇒ 2 = - 4m + c
(3, - 3) ⇒ - 3 = 3m + c
eliminasi:
- 4m + c = 2
3m + c = - 3
__________ -
- 7m = 1
m = - 1/7
c = 2 - 4/7 = 10/7