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They are not.
You must read the x axis and then the y axis always
Linear equations are a small minority of functions.
Isoparametric elements use the same set of shape functions to represent both the element geometry and displacement interpolations (ux, uy). The shape functions are defined by natural coordinates, such as triangle coordinates for triangles and square coordinates for any quadrilateral. The advantages of isoparametric elements include the ability to map more complex shapes and have compatible geometries.
It is [(3 + -13)/2, (3 + -13)/2] = [-10/2, -10/2] = (-5, -5)