Define x and y as the vectors x= 2, 4, 6, 8, 10 and y = 3, 6, 9, 12, 15. The use them in the following expression to calculate z using element-by-element calculations, z = 5xy + y/x + log(10x)/(x + y)^y-x + 12^x/y b.) Solve the following system of four linear equations x + y + z + t = 4 3x + y - z - 4t = 2 2x - y + t = 2 x - 2y - 3z + t = -3