exam Maths Puzzle Numerical Ability

Can you identiy the intercerts and asymtoms of this equation?

f(x) = (2x) / (x + 4)

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exam Other Question

Write equations for the vertical and the horizontal lines passing through the point (2,7) in (x,y) -coordinates. I don't get this question. I know it hads to do with ax+by+c=0. If you can help me that will be great because I have a test on this.