Gas costs a certain amount per litre. The table shows the cost of various amounts of gas.
|Number of litres ($x$x)||$0$0||$10$10||$20$20||$30$30||$40$40|
|Cost of gas ($y$y)||$0$0||$16.40$16.40||$32.80$32.80||$49.20$49.20||$65.60$65.60|
Write an equation linking the number of litres of gas pumped ($x$x) and the cost of the gas ($y$y).
How much does gas cost per litre?
How much would $47$47 litres of gas cost at this unit price?
In the equation, $y=1.64x$y=1.64x, what does $1.64$1.64 represent?
Describe the meaning of the rate of change and the initial value for a linear relation arising from a realistic situation and describe a situation that could be modelled by a given linear equation
Determine values of a linear relation by using a table of values, by using the equation of the relation, and by interpolating or extrapolating from the graph of the relation
Determine other representations of a linear relation arising from a realistic situation, given one representation