Question

How do you solve the system `5x + 6y = 4` and `10x + 12y = 8`?

Answer 1

This system have `oo` solutions because you have the equations of two coincident lines!

Explanation:

The second equation is equal to the first multiplied by `2`! So basically they are the same two lines one on top of the other.
Your two lines share an `oo` number of common points and so they also share an `oo` number of solutions!