Find parametric equations for the line described below. The line through the point P(1, 1, -2) parallel to the vector -5i + 3j - 7k.
a) x = 5t + 1, y = 3t + 1, z = -7t - 2
b) x = 5t - 1, y = 3t - 1, z = -7t + 2
c) x = -5t + 1, y = 3t + 1, z = -7t - 2
d) x = -5t - 1, y = 3t - 1, z = -7t + 2