Question

3/7(0.56-4.9y)-6/13(0.52-3.9y)=0.6

Answer 1

3/7(0.56-4.9у)-6/13(0.52-3.9у)=0.6

0.24-2.1у-0.24+1.8у=0.6

-0.3у=0.6

у=0.6:(-0.3)

у=-2

Answer 2

$frac{3}{7}cdot(0,56-4,9y)-frac{6}{13}cdot(0,52-3,9y)=0,6$

 

$0,24-2,1y-0,24+1,8y=0,6$

 

$-0,3y=0,6$

 

$y=0,6:(-0,3)$

 

$y=-2$

____________________________________________________________________

$frac{3}{7}cdot(0,56-4,9cdot(-2))-frac{6}{13}cdot(0,52-3,9cdot(-2))=0,6$ (это проверка)

 

$frac{3}{7}cdot(0,56+9,8)-frac{6}{13}cdot(0,52+7,8)=0,6$

 

$frac{3}{7}cdot10,36-frac{6}{13}cdot8,32=0,6$

 

$4,44-3,84=0,6$

 

$0,6=0,6$