Testing and graphing direct proportion
Testing and graphing direct proportion
Secondary 2
A shop sells cable at a fixed price per metre. The table shows the cost, \(\$C\), of \(x\) metres of cable.
| \(x\) | \(3\) | \(5\) | \(8\) |
|---|---|---|---|
| \(C\) | \(4.80\) | \(8.00\) | \(12.80\) |
- Show that \(C\) is directly proportional to \(x\), and find an equation connecting \(C\) and \(x\).
- Draw the graph of \(C\) against \(x\) for \(0\le x\le10\).
- State the gradient of your graph and what it represents.
Solution:
Solution locked
680+ questions here come with free worked solutions. A free account saves your questions and progress; this one needs a course plan.
Create a free account to practise similar questions.
Answer:(a) \(C=1.6x\)
(b) Straight line through \(O\) and \((10,16)\)
(c) \(1.6\), the cost in dollars of \(1\) m of cable
Need help? Join our E-Maths tuition for O-Level success.
Learn more