exam Maths Puzzle Numerical Ability

Typical heights and weights for adult men are in the table below

height (in inches) 70 72 74
weight (in pounds) 170 180 190

Explain why these data are linear?
Assuming

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exam Other Question

a,b,c are three distinct real numbers and there are real numbers x,y such that a^3+ax+y=0,b^3+bx=y=0 and c^3+cx+y=0 Show that a+b+c=0 If r and s are roots of x2-8x-3 =0, find the values of 1/r=1/s and (1/r)(1/s)