exam Maths Puzzle Numerical Ability

how would you solve this problem algebracily??

the vectors [8,0] and [3,4] form a parallelogram. find the lengths of its altitudes.

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exam Other Question

Use the echelon method to solve equation.
4x - y + 3z 5 -2
3x + 5y - z = 15
-2x + y + 4z = 14
please simplify this fraction.

6p-18/9p divided by 3p-9/p^2+2p