Explanation:
A equation of a line can be represented by
![y = mx + b](https://img.qammunity.org/2023/formulas/mathematics/high-school/keg32d8l1q1bmgrzozsqjlg25iqjd0uxl8.png)
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
![y = 0(x) + 4](https://img.qammunity.org/2023/formulas/mathematics/high-school/hzefzd7dbyj5m13j2kysaw97yqjpn4qvyr.png)
![y = 4](https://img.qammunity.org/2023/formulas/mathematics/high-school/mvekjkastto13bfivc3fmme17an5o0ij5l.png)
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
![x = a](https://img.qammunity.org/2023/formulas/mathematics/high-school/qcur5bf4keqf1rxpeenqs3ne7n1qyr7e3b.png)
where a is the x intercept
7 is the x intercept so our equation is
![x = 8](https://img.qammunity.org/2023/formulas/mathematics/high-school/ofwgcgq25dhaazmu53u2mjpnqofkb7gdns.png)