Question

Marco made 2 errors in solving the following inequality. Identify the mistakes and correctly solve.

-18 - 4y > 20

-4y > 2

y > -1/2

Answer 1

Explanation:

When moving -18 to the other side, he didn’t do 20 + 18. (Mistake 1)

When dividing 2/-4 he didn’t flip the inequality from > to <. (Mistake 2)

Correct:

`-18-4y<20\\-4y<38\\y > -9.5 (or -4(1)/(2)`