Question

A teacher asks his students to use the Addition Property of Equalityto write an equation equivalent to x - 9 = 11 Antonio writes* - 9 + 9 + 11 + 9. Stefan writes x - 9+2 -11 + 2 Have bothstudents followed the teacher's instructions? Explain your reasoning

Answer 1

Both students followed the teacher's instruction. The addition property of equality states that if 2 numbers x and y are equal x=y, then, x+a=y+a.

In this case both students applied the property correctly. One of them added 9 to both sides of the equation and the other one added 2 to both sides.

The answer is yes, both followed the teacher's instruction.