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To solve the equation 2x + 5 = 31 using substitution, we need to substitute each number from the given set {6, 13, 18, 26} for x and check which number makes the equation true.
For example, if we substitute x = 6, we get:
2(6) + 5 = 17
This is not equal to 31, so we move on to the next number.
If we substitute x = 13, we get:
2(13) + 5 = 31
This is true, so we have found the number that makes the equation true. Therefore, the answer is x = 13.