Answer:
(a) $3840 (b) 33 copies
Explanation:
Note: Here P refers to total money earned, c refers to copies sold.
(a)
using the given equation:
P = 2300 + 70c
P = 2300 + 70(22)
P = 2300 + 1540
P = 3840
Juan's total pay is $3840 if he sells 22 copies.
(b)
2300 + 70c = 4610
70c = 4610 - 2300
70c = 2310
c = 33
He sold 33 copies to earn total $4610.