i need help it is important

Question

Gavin works as a salesperson at an electronics store and sells phones and phone accessories. Gavin earns a $12 commission for every phone he sells and a $3.50 commission for every accessory he sells. On a given day, Gavin made a total of $135 in commission and sold 12 more accessories than phones. Determine the number of phones sold and the number of accessories sold.

Answer 1

A = 12 + P

A - P = 12

12A -12P = 144

3.5A+12P = 135

15.5A = 279

A = 279/15.5 = 18 accessories

P =6 phones

3.5(18) + 12(6) = 63 + 72 = 135