Solve for x & y...3

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you say y=25 and x=1/2

use determinants, prove they are equal

80(1/2)-(-4*y)=25*5.2-x*0
substitute x and y
80(1/2)+4*25=25*5.2-(1/2)*0
80(1/2)+4*25=25*5.2-(1/2)*0
140=130 => false
 
you say y=25 and x=1/2

use determinants, prove they are equal

80(1/2)-(-4*y)=25*5.2-x*0
substitute x and y
80(1/2)+4*25=25*5.2-(1/2)*0
80(1/2)+4*25=25*5.2-(1/2)*0
140=130 => false

I knew there was something not right here.
 

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