Question

Which equation should be used to solve this problem?
The sum of two consecutive integers is 31. Find the numbers.

Let x = the first number.
x + (x - 1) = 31
x + (2x) = 31
x + (2x + 1) = 31
x + (x + 1) = 31

Answer 1

x + (x + 1) = 31

Answer 2

(2k) + (2k+1) = 31

Answer 3

here k is an arbitrary integer