Parametric equations for a straight line would be of the form x= at+ b, y= ct+ d, z= et+ f with t a variable.

x goes from 1 to 0. Can you find x= at+ b so that when t=0, x= 1 and when t= 1, x= 0?

y is always -2. Can you find y= ct+ d so that when t= 0, y= -2 and when t= 1, y= -2? (Yes, that is really easy!)

z goes from 2 to 1/4. Can you find z= et+ f so that when t= 0, z= 2 and when t= 1, z= 1/4?

(I just chose t= 0 and 1 at the two points to make it easy. There are many different parametric equations for a single line.)