For solving system of equations my problem is:
x-4y=-14
x+5y=13
How do I solve that

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

Explain how you can use the associative property to evaluate (7x50)x4.

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?