Linear Relationships

KindleThe Kindle can tell you how many minutes is left in the book you’re reading based on how fast you read. It knows how quickly you turn the page, and can thus assume how many words you can read in a minute.

The average secondary school student can read 350 words per minute.

Here is the relationship on a table of values:

t (minutes)     W (words)

1                              350
2                             650
3                             950
4                             1250

The equation is W = 300t + 50

Here the graph of this equation:


Per each minute spent reading, the average high school student can read 350 words. This relationship is shown in the equation (W, words read, and t, time spent in minutes) W = 300t +50.