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y - 4 = 4/5 (x - ( - 15))
y - 4 = 4/5 (x + 15) ......... kedua ruas kalikan dengan 5
5y - 20 = 4 (x + 15)
5y - 20 = 4x + 60
- 4x + 5y - 20 - 60 = 0
- 4x + 5y - 80 = 0 atau
4x - 5y + 80 = 0