exam Maths Puzzle Numerical Ability

How can I solve this by elimination method?
x-y=8
6+3y=-2x
And can I solve this in substitution method and get the answer x=18/5 and y=10/5

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exam Other Question

A car takes on 22.7L of gasoline. How many microliter is that? Find the selling price per pound of a coffee mixture made from 8 pounds of coffee that sells for $9.20 per pound and 12 pounds of coffee that sells for $5.50 per pound.

Thank you