A 4-column table with 4 rows. Column 1 is labeled x. Column 2 is labeled y. Column 3 is labeled x + y = 56. Column 4 is labeled 2 x minus 7 = y. All rows are blank. Using the guess and check technique, find two numbers that satisfy both conditions.

The sum of the two numbers is 56.

The second number is seven less than two times the first number.

What is the value of the first number, x?
19
21
31
35