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OCR c2 2014 paper

How would I write it in the form of f(y) for part three

The diagram shows part of the curve y = –3+2 x+4. The point P(5, 3) lies on the curve. Region A is bounded by the curve, the x-axis, the y-axis and the line x = 5. Region B is bounded by the curve, the y-axis and the line y = 3.
(i) Use the trapezium rule, with 2 strips each of width 2.5, to find an approximate value for the area of region A, giving your answer correct to 3 significant figures. [3]
(ii) Use your answer to part (i) to deduce an approximate value for the area of region B. [2]
(iii) By first writing the equation of the curve in the form x = f (y), use integration to show that the exact
area of region B is 14 . 3
[7]

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