What is the connection between the length of one side of an equilateral triangle and the perimeter of the triangle?

Each side of an equilateral triangle is $s$ cm. The perimeter is $p$ cm. Write down a function to show the relationship between $p \text{and} s.$

The length of a rectangle is $3$ cm more than its width. Draw some rectangles that follow this rule.

The length of a rectangle is $3$ cm more than its width. The width of the rectangle is $w$ cm and length is $l$ cm. Write down a function generalising the relationship between $l$ and $w$.

The length of a rectangle is three times its width. Draw some rectangles that follow this rule.

The length of a rectangle is three times its width. Write down a function generalising the relationship between the length and the width.

The length of a rectangle is three times its width. Find a function generalising the relationship between the perimeter and the width.

$x \text{and} y$ are two variables and are connected by the function $y=x-5$. Find three possible pairs of values for $x \text{and} y$.

$x \text{and} y$ are two variables and are connected by the function $y=x-5$. Give three examples of what $x \text{and} y$ could represent.