On the Form 1040-SR Line 11 is your adjusted gross income. As stated on the Form Line 11 is the result of Line 9 minus Line 10.
Line 9 is the sum of Lines 1z, 2b, 3b, 4b, 5b, 6b, 7, and 8.
Line 6b is the taxable portion of your Social Security benefits entered on Line 6a.