Given the equation of the line:

A) You need to remember the Slope-Intercept Form of the equation of a line:

Where "m" is the slope of the line and "b" is the y-intercept.
Then, in order to write the equation, given in the exercise, in Slope-Intercept Form, you have to solve for the variable "y":

Notice that in this case:

B) Given this value of "x":

You need to substitute it into the equation found in Part A, and then evaluate, in order to find the corresponding value of "y":

Hence, the answers are:
A)

B)
