When writing co-ordinates remember to is to put brackets around all your points as this shows that the pointis a co-ordinate and not a random number...
10,11 what? 10 to 11 eggs, a bowling party at 10 to 11???
so when you put (10,11) everyone knows you are talking about a grid.
Another thing to remember while writing co-ordinates is to make sure you start with the x axis first and then the y axis.
if you want any point which is on the line x=y+1 then you would write (10,11) not (11,10)
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