Solve for x & y...3

[nycmathguy]

 

[MathLover1]

incorrect

no solution exist

 

[nycmathguy]

incorrect

no solution exist

Ok. I tried. Can you prove why I am wrong?

 

[MathLover1]

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

 

[nycmathguy]

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.