A manufacturer has two machines which produce dog toys. On Wednesday, machine A operates for 4 hours and machine B operates for 5 hours and 175 dog toys are produced. On Thursday, machine A operates for 6 hours and machine B operates for 5 hours and 225 dog toys are produced. Use the following system:
4x + 5y = 175 and 6x + 5y = 225 where x is the number of dog toys produced by machine A in an hour and y is the number of dog toys produced by machine B in an hour