Equations and inequalities
Answers are for parents and teachers.
1
Solve x + 12 = 30 and check your answer.
x = 18. Check: 18 + 12 = 30.
2
Solve 6x = 54.
x = 9. Check: 6 × 9 = 54.
3
Children under 12 enter a museum free. Write an inequality for the age a of a child who enters free.
a < 12.
4
Describe the graph of x ≤ 7 on a number line.
A filled circle at 7 and an arrow pointing left.
5
Solve x − 4 > 9 and give two whole-number solutions.
x > 13. Two solutions are 14 and 15 (check: 14 − 4 = 10 > 9).