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CAN SOMEONE HELP ME WITH THIS PLEASE IT DUE IN 15 MINS solving systems of three equations with elimination -x-5y+4z=19 4x-5y+4z=19 x+5y=-z=-20 |
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Answer» x-5Y+4z=19___(1)4x-5y+4z=19__(2)x+5y=-z=-20__(3)from 1&3x-5y+4(-x-5y)=19x-5y-4x-20y=19-3x-25y=19____(4)multiply (3) by 5so, 5x+25y=-100___(5)now add (4)&(5)2x=81; x=81/2 PUT into (3)x+5y=-20(81/2)+5y=-205y=-20-(81/2)5y=(-40-81)/25y= -121/2y= -121/10 |
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