We can plug in each number into the equation and see which one makes it true.
1. For x = 6:
2(6) + 5 = 12 + 5 = 17 (not equal to 31)
2. For x = 13:
2(13) + 5 = 26 + 5 = 31 (equal to 31)
3. For x = 18:
2(18) + 5 = 36 + 5 = 41 (not equal to 31)
4. For x = 26:
2(26) + 5 = 52 + 5 = 57 (not equal to 31)
Therefore, the number from the set {6, 13, 18, 26} that makes the equation true is 13.
Using substitution, which number from the set {6, 13, 18, 26} makes the equation 2x + 5 = 31
18
13
6
26
1 answer
1 answer