exam Maths Puzzle Numerical Ability

I need to find the equation for this regression line

x 12 14 10 9 15 8
--------------------
y 29 35 28 23 36 18

Please help

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exam Other Question

Leonor has P10 and P50 bills in her wallet amounting to P250. how many o each denominations does she have, if she has a total of 12 bills? x + 4 over 3 - x - 5 over 6 = 4