Question 563390
(0,b) (1,b+m)are the points

(b+m-b)/1 = m is the slope

The equation of line
(y-y1)= m(x-x1)

plug (0,b) & m in the equation

(y-b)=m(x-0)

y-b=mx

y=mx+b

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substitute -1, b-m in the equation  y= mx+b

b-m = m*-1+b

b-m = b-m

so the point is on the line