exam Maths Puzzle Numerical Ability

15(e)3x = 25................(E)3x = 5/3

cos(3x) = 5(x)2 (x squared)

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exam Other Question

find the approximate numerical value of e4 My study question asks....Solve the following systems of equation by any method.

All I am asking for is the name of a method so I can look up the order or way to solve it.

3x-2y=12

and

2x+y=8

Thanks!