book Maths Puzzle Numerical Ability

Hi, I am having trouble with the following homework question:

Generate a table and a graph for y=5x-2.

Thank you for your help!

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In large data sets(1,000 or more values),the mean is always one of the data values. Why would this be true or false?
write the equasion, in slope intercept form, of the line that passes through the point (-7,3) and is perpendicular to the line y=3x-5