What is the product? 2x( -1 0)

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

The cost of a taxi ride includes an initial charge of $2.00. if a 5km ride cost $6.00 and a 10km ride cost $10.00, determine the cost of a 15km ride.

Need plz been trying to do it for a long time and still haven’t succeeded