Using substitution, which number from the set {8 , 12 , 16 , 20} makes the equations x/4 + 2 = 5 true?
8
16
12
20
To find out which number makes the equation true, we substitute each number from the set {8, 12, 16, 20} into the equation and see which one satisfies the equation.
1. For x = 8:
8/4 + 2 = 2 + 2 = 4
4 ≠ 5, so 8 does not make the equation true.
2. For x = 12:
12/4 + 2 = 3 + 2 = 5
5 = 5, so 12 makes the equation true.
3. For x = 16:
16/4 + 2 = 4 + 2 = 6
6 ≠ 5, so 16 does not make the equation true.
4. For x = 20:
20/4 + 2 = 5 + 2 = 7
7 ≠ 5, so 20 does not make the equation true.
Therefore, the number that makes the equation x/4 + 2 = 5 true is 12.