## All Tasks

#### Gradient and term

Cross the right statements for the function y = mx with the gradient m.

# Unassigned

Reasoning

8

#### Graph_parallel_perpendicular (Intermediate-Exercising)

The lines $r, s, t, u, v$ are represented in the figure.
State whether the following statements are true (T) or false (F).
- The lines $u$ and $v$ are parallel. **________**
- Line $s$ is perpendicular to line $v$. **________**

# Linear functions

Training

9

#### Race (Intermediate-Modelling )

Three friends decided to take a run. Ana used a bicycle, Filipa and Joana used cars. Joana's car is faster than Filipa's.
Each function of the figure corresponds to the race of each of the friends.
The expression $g(5)=125$ means that:

# Linear functions

Modeling

9

#### Devaluation of a product (E_M)

Due to wear, the value (V) of a product decrease with time (t). We can then consider the devaluation of a product as a linear function. Knowing that the value of a machine today is 1000 euros, and estimating that in 5 years it will be 250 euros, what will its total devaluation be after 6 years?

# Linear functions

Modeling

9

#### Positive and negative slopes

Can you identify which slopes are positive and which are negative?
Select all and only those graphs that have positive slopes.

# Linear functions

Training

8

#### From table to law

If x and y of the table are proportional, find the law of a proportional function that fits to the data given in the table.

# Unassigned

Training

8