Answer:
replace the value of x but x cannot be 0 or a negative number
Explanation:
for example:
replace x with 1===> y will be =0 cuz ln(1) = 0
replace x with 2==> y will be = 0.7 cuz ln(2)= 0.7
replace x with 3==> y will be = 1.1 cuz ln(3)= 1.1
replace x with 4==> y will be = 1.4 cuz ln(4)= 1.4
but the graph of ln(x) is famous
check it on the web