Nicole and Elizabeth are reading the same book. At the beginning of the month, Nicole was on page 36 and Elizabeth was on page 4. Nicole will read 2 pages per day and Elizabeth will read 10 pages per day. Let NN represent the page of the book that Nicole is on at the end of tt days into the month, and let EE represent the page of the book that Elizabeth is on at the end of tt days into the month. Graph each function and determine after how many days, t, commat, Nicole and Elizabeth will be on the same page of the book.

1 answer

To find when Nicole and Elizabeth will be on the same page of the book, we will first express their pages in terms of \( t \), the number of days into the month.

For Nicole, who starts on page 36 and reads 2 pages per day: \[ N(t) = 36 + 2t \]

For Elizabeth, who starts on page 4 and reads 10 pages per day: \[ E(t) = 4 + 10t \]

We want to find the value of \( t \) when Nicole and Elizabeth are on the same page, which means we set \( N(t) \) equal to \( E(t) \): \[ 36 + 2t = 4 + 10t \]

Now we solve for \( t \). First, rearranging the equation gives: \[ 36 - 4 = 10t - 2t \] \[ 32 = 8t \] \[ t = \frac{32}{8} = 4 \]

Conclusion:

After 4 days, \( t = 4 \), Nicole and Elizabeth will be on the same page of the book.

Checking:

Now we can check the pages they will be on after 4 days:

  • For Nicole: \[ N(4) = 36 + 2(4) = 36 + 8 = 44 \]

  • For Elizabeth: \[ E(4) = 4 + 10(4) = 4 + 40 = 44 \]

Thus, both Nicole and Elizabeth will be on page 44 after 4 days.

Graphing:

To illustrate, you can plot the two functions \( N(t) \) and \( E(t) \) on a graph:

  • The function \( N(t) = 36 + 2t \) is a straight line with a y-intercept at 36 and a slope of 2.
  • The function \( E(t) = 4 + 10t \) is also a straight line with a y-intercept at 4 and a slope of 10.

At \( t = 4 \), the two lines intersect, confirming they are on the same page after 4 days.