exam Maths Puzzle Numerical Ability

Please help with this problem
The complex numbers 2/5xi + 3 and -4 - 1/4yi are equal. Find the values of x and y
Have tried solving as a regular equation but cannot find equal values.

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exam Other Question

Find all values of x in the interval 0 degrees is less than or equal to x which is less than 360 degrees that satisfy the equation 3cosx+sin2x=0. Can you please take the time to help me solve this problem: Determine whether each of the following functions is even, odd, or neither: f(x) = x2 + 81,
g(x) = x3, and h(x) = x2 +