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Is it and addition/elimination, multiplication or substitution.
Identify which process you should use to solve the simultaneous equation.

A  B 
xy=2 + x+y=4  addition/elimination1 
ab=6 + a+b=2  addition/elimination2 
x2b=5 + x+2b=3  addition/elimination3 
2xy=6 + x + 3y=3  multiplication4 
2xy=8 + x+3y=4  multiplication5 
3x2y=8 + x+4y=2  multiplication6 
2x+y=6 + y=x  multiplication7 
4x+6y=16 + y=2x+8  multiplication8 

 