The image shows the following (using the appropriate fonts,
where the equations are aligned on the equals sign, and the
equation numbers are by the right margin):

The function f(x) is given in Equation (9.4) and its
derivative f'(x) is given in Equation (9.5).
f(x) = 2 x + 1 (9.4) f'(x) = 2 (9.5)