Question

y ; 0,25 +  6,7 x y - \(\dfrac{7}{10}\) x y = 4,5

Answer 1

`=>yxx4+6,7xxy-7/10xxy=4,5`

`=>y xx(4+6,7-7/10)=4,5`

`=>y xx(40/10+67/10-7/10)=9/2`

`=>y xx 10=9/2`

`=>y=9/2:10`

`=>y=9/20`

Answer 2

\(\Leftrightarrow y:\dfrac{1}{4}+6,7\times y-\dfrac{7}{10}\times y=\dfrac{9}{2}\)

\(\Leftrightarrow y\times\left(4+6,7-\dfrac{7}{10}\right)=\dfrac{9}{2}\)

\(\Leftrightarrow y\times10=\dfrac{9}{2}\)

\(\Leftrightarrow y=\dfrac{9}{2}:10\)

\(\Leftrightarrow y=\dfrac{9}{2}\times\dfrac{1}{10}\)

\(\Leftrightarrow y=\dfrac{9}{20}\)