It is like me asking you solve for x and y the following: 0(x) + 0(y) = 4.. No solution right? So the same applies above, you need to work with these constants to see if there exists parameters for your variables, and if they do exist, then you should get one parameter and express all your other variables in terms of this parameter and write it out in parametric form.. If values do not exist, then this means planes do not intersect, implying they are parallel (in R^3). Don't worry about it too much, once you learn solving systems of equations using matrices etc. this question will be pretty easy to do, and even easier when you learn Vector Geometry later in the course..
and kudos to Integrand as well, for his solid explanations