Answer: B has only one unique intercept.
Step-by-step explanation: line has only one unique intercept when it is not a vertical or horizontal line, which means it has a slope.
In this case, line A has the equation x = 8, which is a vertical line and does not have a slope, thus it does not have a unique intercept.
Line B has the equation -8x - 7y = -7, which has a slope of -8/7. Since it has a slope, it has one unique intercept.
Line C has the equation 9y = 5, which is a horizontal line and does not have a slope, thus it does not have a unique intercept.
Line D has the equation -3x - 3y = 0, which has a slope of -3/-3 = 1. Since it has a slope, it has one unique intercept.
Thus, only line B has only one unique intercept.