1) We have "x = 3x + 4y - 2(x + 2y) = 1 - 6 = -5." Then calculate "y = \\frac{3 - x}{2} = \\frac{8}{2} = 4." Answer: c.
2) We have "1 \\cdot 4 - 3k = 0." Then "k = \\frac{4}{3}." Answer: a.
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