Straight Line Graphs
Straight line graphs are used when the value of each variable changes at exactly the same rate, such as an hourly wage (without overtime) and the number of hours worked. Say the hourly wage is £3. The total wage for 10 hours’ work would be £30 (£3 × 10 = £30). For 20 hours, it would be £60 — twice as much. What would the total wage be for 15 hours?
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