exam Maths Puzzle Numerical Ability

If f(x)=3x^2-7 and g(x)=2x+a, find a so that the graph crosses the y-axis at 68.

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Can someone help me on this problem #8, on page 577?
In case you don't have the textbook, here is the question:
Between 1950 and 1997, did the production of motor vehicles incre what do points on the line parallel to the y-axis and 5-units to the left of it have in common?with a solution.