curve sketching (1 Viewer)

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hey guys does anyone know how to find the second equation, I can only find 6a+2b=0 with the given info. thanks!!Screen Shot 2021-02-13 at 9.18.10 pm.png
 

Wizjaro

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use the given equation itself substitute x=1 and y=-2 i.e.
a(1)^3+b(1)^2-(1)+5=(-2) which gives the second equation a+b=-6
Then simultaneous equations your way.
 

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