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(x1,y1) = (2,3)
(x2,y2) = (-5,-1)
dit. : persamaan garis lurusnya
dijawab : y-y1/y1-y2 = x-x1/x1-x2
y-3/3-(-1) = x-2/2-(-5)
y-3/4= x-2/7
(7)(y-3)=( 4)(x-2)
7y - 21 = 4x -8
7y - 4x = -8 +21
7y - 4x -13 = 0