Final answer:
To create a system of equations that has infinite solutions, multiply the given equation by a constant and add it to the original equation.
Step-by-step explanation:
To create a system of equations that has infinite solutions, we need to find a second equation that is proportional to the given equation. We can accomplish this by multiplying both sides of the given equation by a constant. Let's choose a constant of 2:
10x - 4y = 20
By adding this new equation to the original equation, we will end up with a system of equations that has infinite solutions.