Answer:
Cost to a rent a snorkel
, Cost on 10 rent snorkel 
Step-by-step explanation:
Given,
Tourist spend on rent snorkel and fin=
10 snorkel and 12 pairs of fin
Let the cost to rent a snorkel be =
x
and cost of a pair of fin is =
y
x=3y (given condition)






Cost of a pair of fin= 



Cost of rent a snorkel
Total cost of a rent snorkel

=
The correct answer would be (4,-5)
V3+4v2-5v+3v2+12v-15
v3+7v2+7v-15
Solve the equation for x:
4x+12=48
Subtract 12 from both sides: 4x=36
Divide 4 from both sides to isolate x: x=9