Explanation:
A equation of a line can be represented by

Where m is the slope and b is the y intercept.
For Line A, the slope is 0 so our m is 0 and our y intercept is 4 so our equation will be


For the second equation, qe have no y intercept and a undefined slope so that means that our equation will be in the form of

where a is the x intercept
7 is the x intercept so our equation is
