In the graph z1 and z2 are complex numbers represented as vectors from the origin. What is z2-z1?

Finding the complex numbers and subtracting them, it is found that z2 - z1 = (0, -4).
They are in the format:
z = a + bi.
In which:
In a graph, the real part is the horizontal axis, while the imaginary part is the vertical axis. Hence, the numbers are given by:
To find the result of the subtraction, we subtract each part, hence:
z2 - z1 = (2,1) - (2,5) = (2 - 2, 1 - 5) = (0, -4).
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