To analyze the given system of equations:
- The first equation is \(y = -3x + 7\).
- The second equation is \(y = -3x - 7\).
From this, we can determine the following:
- Both equations have the same slope of \(-3\).
- The y-intercepts are different: \(7\) for the first equation and \(-7\) for the second equation.
Since the slopes are the same (both are \(-3\)) but the y-intercepts are different, this means the two lines are parallel.
Thus, the correct description is:
"Both equations have a slope of \(-3\), but they do not share the same y-intercept. Thus, the system has no solutions because the lines are parallel."