Hi Rom,

Thank you so much for your answer, and with your help I think I almost get it,

The thing I have to do, is plug 0 instead of x and solve it

then plug 0 again instead of y

Then solve it and it will give me the point of the x and y axes than I have to plug in ?

I try to do (a) again first, alone to see if I get the same result as you did !

And then work on (b) thanks so much, enjoy your day !