step 1; write the molecular equation, that is
NaBr(aq) +AgNO3 (aq)---> AgBr(s) +NaNO3 the equation is balanced
ionic equation is therefore
Na+(Aq) +Br- (aq) + Ag+(aq) + No3-(aq) --->AgBr(s) +Na+(aq) + No3-(aq)
net equation
Ag+(aq) +Br-(aq) --->AgBr(s)