exam Maths Puzzle Numerical Ability

Can you help me to solve these systems using the process of elimination

y=2x y=-2/5x-18
y=3x-2 2x-3y=22

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exam Other Question

answer for one video club charges $25 to become a member and $2.50 to rent each video another charges no rental fee and $3.25 to rent each video how many videos must you rent to make the first club more economical Find g(f(x)) for the following:

f(x) = (x^3) - 1, g(x) = (x+1)^(1/3)