James Anderson School has 156 students. Grade 5 has 43 students and grade 6 has 42 students. What equations can be used to find how many students the rest of the school​ has? Complete the equations. ​___​___x x​___ ​___​___y y​___

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.