# Practical linear relationships

## Interactive practice questions

The points show the relationship between water temperatures and surface air temperatures.

a

Complete the table of values:

 Water Temperature (°C) Surface Air Temperature (°C) $-3$−3 $-2$−2 $-1$−1 $0$0 $1$1 $2$2 $3$3 $\editable{}$ $\editable{}$ $\editable{}$ $\editable{}$ $\editable{}$ $\editable{}$ $\editable{}$
b

Continue the pattern in the table to determine the surface air temperature when the water temperature is $4$4 °C.

c

What would be the surface air temperature when the water temperature is $14$14 °C?

Easy
Approx 4 minutes

Amy is gathering data on the growth of her plant. This is the data she has collected so far.

Justin is looking into the details of his mobile phone plan. He knows the costs for several call lengths.

### Outcomes

#### 9P.LR3.04

Express a linear relation as an equation in two variables, using the rate of change and the initial value

#### 9P.LR4.03

Determine other representations of a linear relation arising from a realistic situation, given one representation