Rearrange to standard form:-
x^2 - 10x + y^2 = 11
(x - 5)^2 - 25 + y^2 = 11
(x - 5)^2 + y^2 = 36
Center of circle = (5, 0) and radius = sqrt36 = 6
I'm not sure how euros work but I'm almost certain there are 18 20p coins
If you look at the end points you see they are different the hole one means the line doesn't reach that point but gets really really close the solid one means starting at that point.
The slope is 2/1. The y increases by two every time the x increases by 1
