Question

The graph shows the girth, in cm, of the trunk of an oak tree after different numbers of years: Line joining ordered pairs 0, 7 and 1, 8.5 and 2, 10 and 3, 11.5 and 4,13 and 5,14.5 What does the y-intercept of the graph represent?

Answer 1

He’s correct

Explanation:

Answer 2

The girth increases by 7 cm each year.

Explanation:

Let y axis represents the girth in cm of the trunk of a fir tree and

x axis represents time in years.

Using the formula for slope : For any two points (x1 , y1) and (x2 , y2) the slope of the line(m) is given by:

m=y2-y1/x2-x1

From the graph:

Take any two points to find the slope of the line:

Let two points be (0, 5) and (5, 40)

Then, by the formula of slope:

m = 40-5/5-0 = 35/5 = 7

Therefore the answer is

The girth increases by 7 cm each year.

I hope that this has satisfied you, and if not, then feel free to ask questions.