Construct a linear model from a description

Let \(H\) represent height in cm, and let \(w\) represent time elapsed in weeks. One unit of \(w\) represents 1 week

At the start of the observations, a tomato plant has a height of 29 cm. Its height then increases by 3 cm per week

Fractional input values are permitted within the stated interval

The linear model is claimed for \(0 \le w \le 19\)