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m= 7-(-2) per 2-(-1)
m= 9 per 3
m= 3
lalu masukkan K dan M
m= y1 - y2 per x1 - x2
3= 7 - 10 per 2 - a
3 per 1 = -3 per 2 - a
** dikali silang
-3 = 6 - a
a = 6 + 3
a = 9