For two lines to be parallel, they have must the same slope. The slope of the given line is -1/4, hence the slope of the other line must be -1/4 as well.
To determine the equation of the line having the slope of -1/4 and passing through the point (2, -1), we can use the formula below:
![y-y_1=m(x-x_1)](https://img.qammunity.org/2023/formulas/mathematics/high-school/csobd57zth7rh9k4hz9amldzpq2owf0z4j.png)
Let's plug in the given information above to the formula.
![y-(-1)=-(1)/(4)(x-2)](https://img.qammunity.org/2023/formulas/mathematics/college/dzftv3clru6dcesz58d1t55njqzpr48pj9.png)
Then, solve for y.
![\begin{gathered} y+1=-(1)/(4)x+(1)/(2) \\ y=-(1)/(4)x+(1)/(2)-1 \\ y=-(1)/(4)x-(1)/(2) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/wc35pppqattr676mndu8wqqjiu51ukztg8.png)
Therefore, the equation of the line must be y = -1/4x - 1/2 (Option C).