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y2-y1=m(x2-x1)
Sustituyes valores y queda
4-2=m(3-(-5))
2=m(8)
m=2/8=0.25
La ecuacion de la recta es y=mx+b
tienes m=0.25 y tienes el punto (x,y) (1,-3)
-3=(0.25)(1)+b
despejas b
-3/0.25=12=b
la ecuacion queda
y=0.25+12