book Maths Puzzle Numerical Ability

My algebra problem is: TC=1600+120Q-0.4Q^2-0.002Q^3; Q=1200-4P. I know how to substitute Q=1200-4P for Q in the first problem, however I have forgotten how to solve the equation w

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Solve the system by the substitution method.



x - 3y = 25
-6x - 4y =-18 the mesures of two complementary angles are represented by x+5 and 4x-15 find the value of x