exam Maths Puzzle Numerical Ability

y=12x-3. the slope is

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So that zip codes may be machine readable, the postal service encodes them as a group five bars, some tall, some short, in groups osf five. In how many distinct ways can two tall and three short bars be arranged? Assume that y varies inversely as x. If y = 4 when x = 1/2, find y when x = 2