56/25= $2.24 per gallon (Wow that's a lot)
32.05/15= $2.14 per gallon (Better....but not really)
It would be best to buy 15 gallons for $32.05
The number line is a graph of the Integers
Volume of a cube is s^3, where s is the length of a side.
Volume = 7 ^3
Volume = 343 cubic inches.
Reduced traffic on the road
A system of linear equations

has:
1. unique solution, when:

;
2. no solutions, when:

;
3. infinitely many solutions, when:

.
According to the part 3 you can create such system:
Graphs (the same line) are shown on the added picture.