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

how do i solve the system by graphing.
x - y = 5
x + y = 3
4 2nd power + 2 x 7 – (5 x 4 – 15)