book Maths Puzzle Numerical Ability

for the pair of functions defined, find f+g, f-g, fg, and f/g. give the domain of each. probelm; f(x)=6-3x,g(x)=-4+1... Thanks so much!

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book Other Question

This is a graph question. Point A is plotted on the 2 on the Y-axis and point B is plotted on the 3 on the X-axis so I think that is--(0,2) (3,0). How do I find which equation r why do we factor first when solving a quadratic equation.