Question

A construction crew is lengthening a road. Let y represent the total length of the road (in miles). Let x represent the number of days the crew has worked. Suppose that x and y are related by the equation y= 2x + 57.

Answer 1

We are given the equation

`y=2x+57`

(a)

The change per day in the road length is simply the slope of the above line

Therefore, the answer is

`2`

(b)

To find the length of the road when the crew started working is simply the intercept

Therefore, the answer is 57