If p(x,y) is any point on the line joining the points A(a,0) and B(0,b) then show that x/a+y/b=1

If p(x,y) is any point on the line joining the points A(a,0) and B(0,b

1.	If p(x,y) is any point on the line joining the points A(a,0) and B(0,b) then show that x/a+y/b=1
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