book Maths Puzzle Numerical Ability

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?

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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 please help me find the sum by graphing the corresponding vectors. (1-2i) + (3 + i)i dont even know what that means!