Question

hallar y :
5x-y=23
2x+y=19​

Answer 1

Respuesta:

1. $\\\frac{x}{5}-\frac{23}{25} =y$

2.$\\-\frac{x}{2} -\frac{19}{4} =y$

Explicación paso a paso:

1.

$5x-y=23\\5x=23+y\\x=\frac{23}{5} +\frac{y}{5} \\x-\frac{23}{5}=\frac{y}{5}\\\frac{5x-23}{5} =\frac{y}{5}\\\frac{5x-23}{\frac{}{} \frac{\frac{5}{5}}1} =y\\\frac{5x-23}{25} =y\\\\\frac{x}{5}-\frac{23}{25} =y$

2.

$2x+y=19\\2x=19-y\\x=\frac{19-y}{2} \\x-\frac{19}{2} =-\frac{y}{2} \\\frac{2x-19}{2}=-\frac{y}{2} \\\frac{2x-19}{\frac{}{} \frac{\frac{2}{2}}1} =-y\\\frac{2x-19}{4} =-y\\\\\frac{2x-19}{\frac{}{} \frac{\frac{4}{-1}}1} =y\\-\frac{2x-19}{4} =y\\\\\frac{-x}{2} -\frac{19}{4} =y$