book Maths Puzzle Numerical Ability

Furst of all, thank you for all the recent help-I think I may be getting this, but, of course, something else has come up and has stopped me. May I ask for help with this?:
in sol

Read Solution (Total 0)

book Other Question

The Set of numbers A={2,3,4,5} and an operations called *. Results for * are given below

* 2 3 4 5
---------------
2| 3 2 3 4
3| 2 3 4 5
4| 3
I need to know how to graph
x+2y=3
3x-y=-5

And I also need to know how many solutions it has.
Could you please help me? thanks!