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Quiz

Grade 9: Simultaneous equations and linear functions

10 easy questions for grade 9, following the national curriculum: elimination, y = mx + c, gradient, inverse function.

Type the number or choose the right answer. When you finish, click Check answers and see the solutions.

1. x + y = 10, x − y = 2. x = ?

2. x + y = 10, x − y = 2. y = ?

3. 2x + y = 8, x − y = 1. x = ?

4. Which pair (x, y) solves x + y = 5, x − y = 1?

5. A class has 28 pupils. There are 4 more girls than boys. How many boys?

6. y = 2x + 1. What is y when x = 3?

7. What is the gradient m of y = 3x − 5?

8. Write 2y = 4x + 6 in the form y = mx + c.

9. What is the inverse of y = 2x?

10. A taxi charges 50 denars to start and 30 per km. How much is a 4 km ride?