Ononot — If the lines x + 2y + 1 = 0, 3x + y - 2 = 0, and ax - y + 4

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Coordinate Geometryhard

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If the lines $x + 2y + 1 = 0$ , $3x + y - 2 = 0$ , and $ax - y + 4 = 0$ are concurrent, find the value of $a$ .