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m = ( -13 - 1 ) : ( -4 - 3 )
m = 2
2 = ( 1 - p ) : ( 3 - 10 )
-14 = 1 - p
p = 15
m = 1 + 13 per 3 + 4 = 14 / 7 = 2
karena terletak pada garis yg sama, maka gradiennya sama. untuk mencari p, kita ambil salah satu koordinatnya, misal (3,1)
2 = p - 1 per 10 - 3
2 = p - 1 per 7
14 = p - 1
15 = p