I need the AGI number from last year tax’s

2018 form 1040 line 7.  if the return is not available, you can get a transcript that will have this info from the IRS website. 

Request Online
What You Need
To register and use this service, you need:

your SSN, date of birth, filing status and mailing address from latest tax return, (latest would be 2018) 
access to your email account,
your personal account number from a credit card, mortgage, home equity loan, home equity line of credit or car loan, and
a mobile phone with your name on the account.
What You Get
All transcript types are available online
View, print or download your transcript
Username and password to return later