book Maths Puzzle Numerical Ability

g:x-> x-3 you are supposed to graph this and find four other points i think im not sure

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book Other Question

______8______
5^1/2 + 3^1/2
D= -200p + 35,000
The supply equation is predicted to be
S= -p^2 + 400p - 20,000
Find the equilibrium price.