30 - 6a < -15 + -21

Answer 1

You can use inverse operations to solve this inequality:

30 - 6a < -15 + -21

30 - 6a < -36

30 - 6a - 30 < -36 - 30

-6a < -66

-6a / -6 > -66/-6

a > 11

Remember when multiplying or dividing by a negative number, you need to reverse the inequality symbol. Here we divided both sides of the inequality by -6