book Maths Puzzle Numerical Ability

If ED=x+4 and DB=3x-8,Find EB

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1) 3x=4
x-6
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2) 2x-1
-x+1
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I'm hoping to find the name of a particular graph. The function is f(x)=1/(x^2)+1... Could someone help? I need it within the next few minutes, if possible. Thanks in advanced for