In the hierarchical data model, the mapping from parent to child is: Multiple Choice N:1 (many-to-one) 1:N (one-to-many) 1:1 (one-to-one) N:N (many-to-many)

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.