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16000*2.8+12000*-3.1=16000x+12000y, 0.5*16000*x^2+0.5*12000*y^2=0.5*16000*2.8^2+0.5*12000*3.1^2
16000*2.8+12000*-3.1=16000x+12000y, 0.5*16000*x^2+0.5*12000*y^2=0.5*16000*2.8^2+0.5*12000*3.1^2
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