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(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
(y-5)/(7-5) = (x+1)/(2+1)
(y-5)/2=(x+1)/3
3y-15=2x+2
3y-2x=17
atau bisa pake 7-5 = 2, 2-(-1) = 3. m = 2/3
y-y1=m(x-x1)
y-5=2/3(x+1)
3y-15=2x+2
3y-2x=17