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(y-y1)/(y2-y1) = (x-x1)/x2-x1)
(y-1)/(4-1) =(x-1)/(4-1)
(y-1)/3 =( x-1)/3
3×(y-1) = 3×(x-1)
3y-3 = 3x-3
3y-3x-3+3=0
3y-3x =0
gradien dari persamaan 4y-5x-3=0
m=-a/b
=-(-5)/4
=5/4