2x+y=5
x+3y=5

a.(5,0)
b.(2,1)

2x + 1y = 5 ⇒ 6x + 3y = 15
1x + 3y = 5 ⇒ 1x + 3y = 5  
                               5x = 10
                                5      5
                                 x = 2
                         2x + y = 5
                       2(2) + y = 5
                           4 + y = 5
                         - 4       - 4
                                 y = 1
                           (x, y) = (2, 1)

The answer is B.

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