To find which number from the set {15, 25, 35, 55} makes the equation y + 15 = 40 true, we substitute each of the given numbers into the equation and see which one satisfies the equation.
For the first number, let's substitute y = 15 into the equation:
y + 15 = 40
15 + 15 = 40
30 = 40
Since 30 is not equal to 40, y = 15 does not make the equation true.
Now, let's substitute y = 25 into the equation:
y + 15 = 40
25 + 15 = 40
40 = 40
Since 40 is equal to 40, y = 25 does make the equation true.
We have found the number from the set that satisfies the equation. Therefore, the number from the set {15, 25, 35, 55} that makes the equation y + 15 = 40 true is y = 25.
Using substitution, which number from the set {15, 25, 35, 55} makes the equation y+15=40 true?
1 answer
1 answer