Functions & Relationships: Flow Diagrams, Tables and Formulae

∑ DANEMATHICS

FREE CAPS MATHS RESOURCES

Grade 8 · Functions & Relationships

MEMORANDUM

Name:

Class:

Date:

Mark

/ 14

Answer all questions. Show all your working — marks are awarded for method as well as the final answer. Teacher copy: accept any correct equivalent method.

1
Rule: × 2 + 5. Find the output when the input is 6.
(2)
6 × 2 + 5 = 17✓✓ (2)
2
Rule: y = 4x − 3. Find y when x = 5.
(2)
20 − 3 = 17✓✓ (2)
3
Rule: y = 4x − 3. Find x when y = 17.
(2)
4x = 20 → x = 5✓✓ (2)
4
Rule: × 10. Complete: 3 → ___ and ___ → 70
(2)
3 → 30; 7 → 70✓✓ (2)
5
Find the rule: 1→3, 2→5, 3→7, 4→9
(2)
Differences of 2 → y = 2x + 1✓✓ (2)
6
Find the rule: 1→6, 2→12, 3→18
(2)
y = 6x✓✓ (2)
7
Rule: y = x² + 1. Find y when x = 4.
(2)
16 + 1 = 17✓✓ (2)

TOTAL: 14 marks