exam Maths Puzzle Numerical Ability

Find the center of the hyperbola:

x^2+2x-16y^2-15=0

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exam Other Question

how many ounces of water must be added to 20 ounces of 8% salt solution to make 2% salt soltion y=- x-2 -2
There are brackets in front of the x and behind the -2. So how would I graph the equation.