2 need help understanding

Let -30015 O 10 - 1 10 be the REF of augmented 0 0 0 1 1 - 7 matrix of a linear system AR = 6 0 0 0 0 0 0 Identify Pivots, basic variables, and free variables (if any) and write the solution of the lincar system in vector parametric form 6 ) What is the solution to the homogenous system AX = D