book Maths Puzzle Numerical Ability

Question involvin radicals: parentheses, 6sq.root of 2 minus 2 sq. root of 6, parentheses, everything squared.

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translate"the sum of five times the square of y and the square of x into a mathematical expression. <1 nd <2 are vertical angles.
<1 = 4y + 14
<2= 3x + 7y
Find x and y. When I start 4y+14=3x+7y then I get x= -y + 14/3. When I substitute, I get 14 = 14 and I think this means y=