book Maths Puzzle Numerical Ability

How do i approximat the best fitting line by sketching a scatter plot, sketching the line, locating two points on the line, or by finding the equation of a line?

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book Other Question

Write an expression of the sum of 2 consecutive even integres where 2x is the lesser integer
Thank you for your help
a2-b2 2a2-2a
----- X ------- =
a2-ab a-1