book Maths Puzzle Numerical Ability

Solve the system by the substitution method.

x - 3y = 25
-6x - 4y =-18

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book Other Question

AB = ? , BC = 18.9 , AC = 23 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