What is the solution to the system of liner equations. y-4x=7 2y+4x=2 please help!!

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

If g^-1(x) is the inverse of g (x) which statement must be true