Question

( SHOW WORK NEED IT BY TONIGHT! ) Write a system of equations to describe the situation below, solve using substitution, and fill in the blanks.
Two students in Mr. Kelley's class, Tori and Cora, have been assigned a workbook to complete at their own pace. They get together at Tori's house after school to complete as many pages as they can. Tori has already completed 16 pages and will continue working at a rate of 5 pages per hour. Cora has completed 13 pages and can work at a rate of 8 pages per hour. Eventually, the two students will be working on the same page. How long will that take? How many pages will each of them have completed?


After _ hours, Tori and Cora will have each completed _ pages in their workbooks.

Answer 1

Answer:

1 hour with 21 pages completed for each.

Step-by-step explanation:

First you need to list out what you know.

Tori:

Finished: 16 pgs

Rate: 5 pgs per hr

Cora:

Finished: 13 pgs

Rate: 8 pgs per hr

Now we compose Equations. In an equation we put the rate with the "X" because it is a constant rate of change. The finished amount of pages is our starting point or our y intercept we write it in this format:

y=mx+b

m being the rate of change

b being the initial amount or the starting point

For Tori the equation would be 5x+16 because 5 is our rate of change since she completes 5 pages per hour and 16 is our initial amount since she already completed them.

For Cora the equation would be 8x+13 because 8 is our rate of change since she completes 8 pages per hour and 13 is our initial amount since she already completed them.

we set these equation equal to each other:

5x+16=8x+13

eliminate the 5x on one side to leave the 16 by its self which in this case we subtract 5x to each side and get :

16=3x+13

the we subtract the 13 to leave 3x by its self and subtract 13 on both sides and get :

3=3x

lastly we divide 3 on both sides to isolate x and this would be our hours until they are both working on the same page:

1=x

this gives us 1 which means in 1 hour of working, both Cora and Tori will be working on the same page.

Substitute the 1 for each equation to get the total amount of pages completed in 1 hour:

5(1)+16

5+16

21 pages for Tori

8(1)+13

8+13

21  pages for Cora

Done

In one hour both Tori and Cora will have done 21 pages