Are the following like terms: $$9y and $$7y?

Yes, the terms $$9y and $$7y are like terms. This is because they both have the same variable, y, raised to the same power, which is 1. In algebra, like terms are terms that have the same variables and powers. The coefficients of the variables do not need to be the same. In this case, the coefficients are 9 and 7, but since the variable and power are the same (y^1), these are considered like terms.