Answer:
The number of lenses in one eye of the dragonfly is 30,000
Step-by-step explanation:
Before we calculate the quantity of lenses in one eye of the dragonfly, let us denote the number of lenses in one eye of the dragonfly by "x" and denote the quantity of lenses in one eye of the housefly by "y".
Now, since dragonflies in one eye have 2,000 more lenses than seven times the number that houseflies have, we can represent this mathematically:-
x = 2000 + [7×(y)]
x = 2000 + 7y
Again we learnt that the number of lenses in one eye of the dragonfly plus the number of lenses in the housefly are equal to thirty - four thousand lenses. mathematically:-
x + y = 34000
We now have a set of two equations which are:
2000 + 7y = x ------------ 1
x + y = 34000 ----------- 2
The resulting simultaneous equation can then be solved using elimination or substitution method. Let us use substitution method to solve solve for "y".
In equation 1, x = 2000 + 7y.
We can substitute "x" for 2000 + 7y in equation 2
2000 + 7y + y = 34,000
2000 + 8y = 34,000
8y = 34,000 - 2,000
8y = 32,000
y = 32000/8
y = 4,000 lenses. This is the number of lenses in one eye of the housefly.
Now, substitute y for 4,000 in equation 1 in order to find "x".
x = 2000 + 7(4000)
x = 2000 + 28000
x = 30000 lenses.
Therefore the number of lenses in one eye of the dragonfly is 30,000 lenses.
