exam Maths Puzzle Numerical Ability

please help to solve

x + 3y = 7
xy = 2

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exam Other Question

(3+4 radical sign 6)(-5-2 radical sign 6) Please help me simplify.
I came up with -63-26 radical sign 6
Can someone tell me if this is correct or where I went wrong? solve system by substitution

4x-12y= 5
-x+ 3y=-1