Given that the real part x {\displaystyle x} and imaginary part y {\displaystyle y} of the complex number z = x + i y {\displaystyle z=x+iy} satisfy the equation ( 2 − i ) x − ( 1 + 3 i ) y = 7 {\displaystyle (2-i)x-(1+3i)y=7} , find x {\displaystyle x} and y {\displaystyle y} .
