Using substitution, which number from the set {15, 25, 35, 55} makes the equation y+15=40 true?
25
55
15
35
The correct number from the set {15, 25, 35, 55} that makes the equation y + 15 = 40 true is:
If we substitute 25 for y in the equation y + 15 = 40:
25 + 15 = 40
40 = 40
Therefore, the number 25 makes the equation true.