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jawaban soal 2
obsen A --> Q ( 2,4 ) dan P (1,1)
garis tersebut
obsen B --> P(-1,2) dan Q ( 1,1)
2a) m = (y2-y1) / (x2-x1)
= ( 1+2) / (1-0)
= 3/1
= 3
2b) m = (0-2) / (3+1)
= -2/4
= -1/2
jika kita mengambil 2 titik yang lain , kemiringannya tetap . tidak berubah