book Maths Puzzle Numerical Ability

6x-2y=18, 3x+4y=5, y=-3-3x, -4x=8y-5, -5x+y=3, 8y+5x=24
i really need help solving and graping these problems.

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book Other Question

{{{(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 ____. what is 3/4 minus 5/12?