exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Can you identiy the intercerts and asymtoms of this equation?

f(x) = (2x) / (x + 4) The inventor of a new product believes that the cost of
producing the product is given by the function C(x)= 1.75x+7000

If the inventor charges $4 per unit, then her profit for