Sure, let's break it down!
Let's imagine we have two friends - Alex and Lily. Alex has 10 pieces of candy, and Lily has 3 toys.
They decide to trade some candy and toys to make it even. In the end, Alex ends up with 5 pieces of candy and they both have the same number of toys.
This situation can be represented by the equations - 10x + 3y = 5 and x = y - 4. This means that the value of x (Alex's candy) is equal to the value of y (Lily's toys) minus 4.
So, in this scenario, if Alex has 10 pieces of candy and Lily has 3 toys, the equation -10x + 3y = 5 helps us understand how they exchange items to reach a balance.