Question

Find the student error solving the following inequality

31 < -5x +6
25 < 5x
-5 < x

Answer 1

The student should have switched the direction of the inequality sign to get –5> x for a final answer.

Explanation:

e d g e 2 3

Answer 2

The student did not divide 5 into 25 but subtracted 25 from both sides. It looks like the student then moved the -5 over to the other side somehow.