So we're going to balance the equation:
To do this, what we need to do is to make that both sides of the equation have the same number of atoms of each element, so we're going to count the number of atoms of each element before and after the reaction occurs:
As you can see, all elements are balanced so the balanced equation is:
__1__NaCI + __1___Ag(NO3)—> ___1__Na(NO3)+ __1___AgCI.
This reaction is classified as a double replacement reaction.