the pair of linear equation x=y and x+y=0 has

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a.no common solution

b.infinitely many solutions

c. unique solution

d. none

The given equations arex - y = 0 ......1x + y = 0  ......2Comparing it with standard equation, we geta1x + b1y + c1 = 0  and a2x + b2y + c2 = 0, we geta1 = 1 ; b1 = -1 ; c1 = 0a2 = 1 ; b2 = 1 ; c2 = 0Now,a1a2 = 11 = 1b1b2  = -11 = -1since, a1a2  b1b2 ,so, the given equations has unique solution.

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D) None, as x = y = 0

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