If y is proportional to the square and = 6675 when Y of When c = 12 x = 15, find y when x = 12

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The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?