book Maths Puzzle Numerical Ability

i dont know what to do with this the instructions say solve the system using the linear combination method and i keep doing it & all i do is get stuck....
PLEASE HELP ASAP i need

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book Other Question

I am a returning student after 20 years. Please help me to figure out this problem.

A group of homeowners are to share equally in the $210 cost of repairing a bus-stop shelter n Multiply (X2Y2)(X2Y)
A) 4X2Y B) XY2X2Y C) 2X2Y2Y D) X4Y3