Question

X+3Y=7
2X-Y=O
igualacion

Answer 1

Respuesta:

$\: \: \: \: \: \: \: x+3y=7 \\ </p><p>(3)2x-y=0 \\ \\ x + 3y = 7 \\ 6x - 3y = 3 \\ 7x = 10 \\ x = \frac{10}{7} \: \\ reemplazamos \: (x) \: en \: la \: primera \: ecuacion. \\ x + 3y = 7 \\ \frac{10}{7} + 3y = 7 \\ 3y = 7 - \frac{10}{7} \\ 3y = \frac{49 - 10}{7} = \frac{39}{7} \\ 3y = \frac{39}{7} \\ y = \frac{39}{ \frac{7}{ \frac{3}{1} } } \\ y = \frac{39}{21} \\ comprovacion \\ x + 3y = 7 \\ \frac{10}{7} + (3) \frac{39}{21} = 7 \\ \frac{10}{7} + \frac{39}{7} = 7 \\ \frac{49}{7} = 7 \\ 7 = 7 \\ espero \: que \: te \: sirva...$