Q4 ALGEBRA
The total number of integer pairs (x,y) satisfies the equation x+y = xy is
a.0
b.1
c.2
None
of these xy=x+y
xy-x-y=0
xy-x-y+1=1
(x-1) (y-1)=1
Both x - 1 and y-1 have to be equal to 1 or -1.
So, values taken by (x,y) are (22) and (0,0).
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