exam Maths Puzzle Numerical Ability

find the center,vertices,foci, and asymptotes of the hyperbola 4x2-y2-8x+2y-1=0 and draw a graph

thanks

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exam Other Question

3x-6y=9
x-2y=3

I am supposed to solve and graph.
6y=9+3x
y=9+3x/6
y=9/6+3x/6
y=-1/5+0/5
confused where to go, once I figure the top solution, I know that I need to plug i Larry invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate?