exam Maths Puzzle Numerical Ability

use elimination to solve each system of equations

8a+b=1
8a-3b=3

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exam Other Question

A line contains L(-4, -4) and M(2,3) Line q is in the same coordinate plane but does not intersect LM. Line q contains point N.

This question is from a worksheet my teacher gave Jose has savings accounts for each of his five children.
They contain $215, $156, $318, $75, and $25. Find the median and the mean
amount of money per account.