exam Maths Puzzle Numerical Ability

Having a real hard time with this...please help!

Solve system of equation word problem but either addition method or substitution method.

6x+2y=8
y=-3x

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exam Other Question

I have no idea how to find the domain of problems 3-6. Also, i can't figure out how to factor 18-20. Please help me with this problem (solve the equation and show the steps). Thanks!!
14/(x^2-1)+1/(x-1)=3/x+1