Answer:

Step-by-step explanation:
Given
Represent Goldfish with g and hermit crabs with h.
The first statement, we have:

The second statement, we have:

Required
Determine the selling price of 6 goldfish and 4 hermit crabs
The equations are:
--- (1)
--- (2)
Make g the subject in (2)


Divide both sides by 4

Substitute
for g in (1)



Multiply through by 4


Open bracket


Collect Like Terms


Make h the subject



Substitute 4 for h in 




This implies that:
1 goldfish = $2
1 hermit crab = $4
The cost of 6 goldfish and 4 hermit crabs is:




Step-by-step explanation:
(9-4)/(5+7)= 5/12
y - 4 = 5/12(x + 7)
y - 48/12 = (5/12)x + 35/12
y = (5/12)x + 83/12
Answer:
x<1.912931
Step-by-step explanation: