exam Maths Puzzle Numerical Ability

Solve the following system of equations algebraically:
y = x^2-6x+6
y-x= -4

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exam Other Question

If one riveter can do a job in 12 days, and a second riveter can do it in 16 days, how long would it take them to do it together? Given f(x)=5xsquared-3x+1, find f(x-2)

I came up with x= -25