book Maths Puzzle Numerical Ability

{{{(x-2)^2/9+(y-4)^2/25=1}}} This equation defines an ellipse with center (___, ___). The major axis has length ____ and the minor axis has length ____.

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Jon and Lauren have a combined income of 48,000. Lauren earns 3,000 more than half of what Jon earns. How much does each earn?
The sum of three times one number and twice the second is -1. The ratio of twice the first to 3 times the second is -4:3. What are the numbers? I got the first equation -1=3x+2y.