$500 < or = $415 + d
(subtract the 415 from both sides)
$85 < or = d
Answer:

Step-by-step explanation:
Let

We factor 2 to obtain;

We factor the polynomial within the parenthesis by grouping.



We apply difference of two squares on the second factor: 

We now compare to;

It is now obvious that 
This is the transitive property :)
(1,2)
The solution is where the lines intersect so you can see they intersect at (1,2)