TELL-THE-WORLD !
Online international calling Inc.
Australian Deals!
Deal 1- just 5 cents for every minute you call
Deal 2- start with just 4 cents, plus 4 cents for each minute you talk
Lets Compare!
Deal #1
Deal #2
A deals a deal!
The Variables
Calculate Youself
For deal 1 - y= 5x
For deal 2 - y= 4x+4
Substitute x with the amount of minutes that you talk for. The cost (y) varies directly with the x.
The formula for deal 1 is a direct variation since it has a variable cost(5) which directly varies with the total cost in cents. Another reason is because, it starts at the point of origin and doesn't have a y intercept.
The formula for deal 2 is a partial variation since it has a variable cost (4) and also a fixed cost(4). Another reason is because, it starts doesn't start at the point of origin and has a y-intercept of 4.
We will make it easier 4 you !
Conclusion
Well, which deal is better?
To see which deal is the cheapest, look for the line that is below the other lines, on the graph and also, a point where two lines meet/intersect, for that amount of minutes, the price is the same.
As you can see, it all depends on how long you want to talk for. If you talk for 4 minutes or less, deal 1 is better, but if you love to talk, go for deal 2. If you know that you are going to be talking for only 4 minutes, go for any deal you wish as the price will be the same(shown at point(4,20)where the line intersects).