book Maths Puzzle Numerical Ability

I need help in thinking of a real life situation where trends or data could be graphed so that it results in a parabola. I need to graph it and write the equation for the data as

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y/10 =-2/5 Can you please help me solve
A line passing through (6,9)and (5,y)is parallel to a line with slope 5. What is the value of y?