Question

Using substitution, which number from the set {15, 25, 35, 55} makes the equation y+15=40 true?(1 point)
Responses

15
15

55
55

35
35

25
25

Answer 1

To solve the equation y + 15 = 40 using substitution, we want to find the number from the set {15, 25, 35, 55} that, when substituted for y, makes the equation true.

Let's try substituting each number from the set into the equation:

For y = 15, the equation becomes 15 + 15 = 40. This simplifies to 30 = 40, which is not true.

For y = 25, the equation becomes 25 + 15 = 40. This simplifies to 40 = 40, which is true.

For y = 35, the equation becomes 35 + 15 = 40. This simplifies to 50 = 40, which is not true.

For y = 55, the equation becomes 55 + 15 = 40. This simplifies to 70 = 40, which is not true.

Therefore, the number from the set {15, 25, 35, 55} that makes the equation y + 15 = 40 true is 25.