Solve 9x + 18 = 6y - 3x for y​

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

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

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices