Question

Sharon went to solve the following system and her steps are shown. x - y = 9 x + y = 15 Step One: 2x = 26 Add the systems Step Two: x = 13 Solve for x Step Three: 13 + y = 15 y = 2 Solve for y Was she correct? Justify your answer. If incorrect, describe the error.

Answer 1

The system is almost right! The issue here is: when Sharon was adding the systems, she made a mistake. 15 + 9 = 24 not 26. From there, the rest of her steps are correct. Hope this helps!