book Maths Puzzle Numerical Ability

How many pounds of candy selling for $5.80 per pound should be mixed with 7 pounds of candy selling for $2.40 per pound to obtain a mixture selling for $3.42 per pound?

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My question says to solve the system of this inequalitie by graphing.
x<-4
y>2 (the > has a line underneath of it.)

I dont know how to solve this or graph it. could you hel please help me solve this equation : (2x^3-3x^2-18x-8)/(x-4)