exam Maths Puzzle Numerical Ability

how do i solve the system by graphing.
x - y = 5
x + y = 3

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This is a a phsics homework assignment that i do not understand that deals with radians and trigonometry. Thanks how would you solve this problem algebracily??

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