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z = -4 x-5 y+2
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5y-2y= 3y+2 5y-2y-3y= 2 0y= 2
(2, 1)
y=xsquared-4x+2
x + 5y = 10 5y = -x + 10 y = -x/5 + 2 m = -1/5 or .2
solv by cramr's rule [ 2x - 5y ] = 2 , [-4x + 10y ] = 1