Jeff and george each have a box if popcorn whos box holds more

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

Find dy/dx using implicit differentiation ln(20+e^xy)=y

X+ y = 5 ; x - y =3 solve using linear combination