It is known that the solution X of the system of equations X-Y = 3,2x + y = 6a is nonnegative and Y is less than 3

x-y=3…… ① 2x+y=6a…… ②
① From + 2, we get that 3x = 3 + 6a, ∧ x = 1 + a
Let x = 1 + a be 1 + a-y = 3, y = - 2 + a
1 + a ≥ 0 - 2 + A

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