exam Maths Puzzle Numerical Ability

I need your help solving this problem:3x+y-1=49

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The velocity of a falling object is a linear function of the time t it has been falling. If v = 3 when t = 0 and v = 80 when t = 11, express v as a function of t. Suppose that 2^a + 2^b = 3^c + 3^d, where all of the exponents are integers. How many of a, b,c, and d could be negative?