Divide £80 in the ratio 3 : 5

30:50 or 3:5

Step-by-step explanation:

3/8 * 80 = 30

5/8 * 80 = 50

i'm not sure what type of money that is, but i think its euros,        30 euros to 50 euros

How about the following ordered pairs:
(4,3)  (3,2) and (2,1).. you might consider writing the equation in the following form:  y = x - 1 to generate additional ordered pairs..

To graph:  plot the point (0,-1)... from this point to get additional points, just go up 1 and to the right one from each additional point.  You could also go down one and to the left one..   Happy Graphing!