Answer:
Cost = cost of first painter + cost of second painter
= $12/hr * hours worked + $11 * hours worked
where x is the hours the first painter works
C(x) = 12 x + 11 ( 15 - x)
= 12 x + 165 - 11x
= x + 165
C(x,y) = 12 x + 11 y
where y = 15 - x because the total hours is 15
Step-by-step explanation:
Lmk if I need to explain