Kayla and Riley both solved the equation x+15 = 13+7, using substitution. Kayla says the answer is x = 20, and Riley says that answer is x=35. Which student is correct?

Answer 1

To solve the equation x + 15 = 13 + 7, we first simplify the right side of the equation:

13 + 7 = 20

Now, the equation becomes:

x + 15 = 20

To solve for x, we subtract 15 from both sides:

x = 20 - 15
x = 5

Therefore, Kayla is correct and the answer is x = 5.