Using substitution which number from the set 15,25,35,55, makes the equation y+15=40 true?
To find the number from the given set that makes the equation true, we substitute each number into the equation and see if it satisfies the equation.
If we substitute 15 into the equation:
y + 15 = 40
15 + 15 = 40
30 = 40
Since 30 is not equal to 40, 15 does not make the equation true.
If we substitute 25 into the equation:
y + 15 = 40
25 + 15 = 40
40 = 40
Since 40 is equal to 40, 25 makes the equation true.