We know that Billy needs to make more than between his allowance and the lawns that he mows. This means our inequality should include

Also, since Billy will make per lawn, that means we need to multiply by the number of lawns he needs to mow, :

So far we have the following:

Next, we know that he makes each week, on top of what he makes mowing each law.

This means we need to add the to the

When we put all of these pieces together, we will get the following inequality: