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Show that the system of equations ` - x + 2y + 2 = 0 and (1)/(2) x - (1)/(2) y - 1 = 0 ` has a unique solution.

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The correct Answer is:
Yes, Here `(a_1)/( a_2) = -2 and -8 rArr (a_1)/(a_2) ne (b_1)/(b_2)`
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