book Maths Puzzle Numerical Ability

a2-b2 2a2-2a
----- X ------- =
a2-ab a-1

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book Other Question

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? what is the soultion to this simultaneous equation using substion or addtion method?
2x+3y=-5
3x-y=20