using substitution, which number from the set { 6, 13, 18, 26 } makes the equation 2x + 5 = 31 true? A 18. B 6. C 26. D 13.
Let's check each number from the set { 6, 13, 18, 26 } in the equation 2x + 5 = 31:
For x = 6: 2(6) + 5 = 12 + 5 = 17
For x = 13: 2(13) + 5 = 26 + 5 = 31
For x = 18: 2(18) + 5 = 36 + 5 = 41
For x = 26: 2(26) + 5 = 52 + 5 = 57
Therefore, the number that makes the equation 2x + 5 = 31 true is x = 13 from the set { 6, 13, 18, 26 }. Therefore, the answer is D) 13.