Representation of Phenomena: Linking function properties to its representation

Let's first observe the X-axis which is representative of the weight. Locate 7 kg - and mark a point.

From this point, we'll draw a vertical line until we meet the straight line.

Let's now observe the Y-axis which is representative of the price.

We will draw a line from the point where we reached the X-axis to the straight line, towards the Y-axis and determine the price: 8 dollars.

Let's first observe the Y-axis which is representative of the price. Locate 9 dollars - and mark a point.

From this point, we'll draw a vertical line until we meet the straight line.

Now let's observe the X-axis which is representative of the quantity in kg.

We'll draw a line from the point where we reached the Y-axis to the straight line, towards the X-axis and determine the weight: 8 kg.

Let's look at the red line:

The X-axis shows us the quantity, we'll locate 7 kg and from it draw a vertical line to the line - mark a point.

From this point we'll draw a horizontal line to the Y-axis which shows the price and we'll see that 7 kg costs 8 NIS.

Let's look at the blue line:

The X-axis shows us the quantity, we'll locate 7 kg and from it draw a vertical line to the line - mark a point.

From this point we'll draw a horizontal line to the Y-axis which shows the price and we'll see that 7 kg costs 10 NIS.

Therefore it's better to buy at the red store, it's cheaper.

Let's begin by observing the blue line that represents the second container.

Note that it will be full at the point where it starts to become a continuous line.

Hence let's draw a vertical line from this point to the X-axis which marks the minutes.

We can observe that the line reaches 22, meaning the container will be full in 22 minutes.