In this graph, 𝑥 and 𝑦 are directly proportional. This means that when 𝑥 doubles, 𝑦 also doubles, and when 𝑥 triples, so does 𝑦. In fact, for all coordinates on this line, you could multiply or ...

8 pens cost £2.16. Calculate how much 7 pens cost. To find out the cost of one item use the unitary method - divide the cost by how many items have been bought. Any amount can be calculated when the ...