book Maths Puzzle Numerical Ability

Multiply (X2Y2)(X2Y)
A) 4X2Y B) XY2X2Y C) 2X2Y2Y D) X4Y3

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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 find the slope of a line through the points (-2,-1) and (4,2)