exam Maths Puzzle Numerical Ability

Tutor,

I have a question. I have to match graphs with these equations. I think I have them correct but I am not sure what kind of work I would show for these problems. Could

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exam Other Question

Given a set of points, the least squares line formed be letting x be the independent variable will not necessarily be the same at the least squares line formed by letting y be the find the equation of the line that contains point (8,-1) and is perpedicular to the line y= 1/4x + 3