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M= y2-y1 -1 -1 -2
------- = ------- = ----
x2-x1 -2 +5 3
persamaan garis :
y-y1 = m(x-x1)
y-5 = -2/3 ( x-1)
3y-15 = -2(x-1)
3y-15=-2x+2
3y+2x=15+2
3y+2x=17
-3 {y-5} = -6 {x-1}
-3y + 15 = -6x + 6
6x - 3y +15 - 6 = 0
6x - 3y + 9 = 0 atau = 6x - 3y = -9