Question

Resolver gráficamente 2X + Y = 7 3X – Y = 3. Doy 40 puntos al que lo haga CORRECTAMENTE, urgente es para mi tarea

Answer 1

Respuesta:

x=4

Explicación paso a paso:

2x+10x=y-y=3=

12x=3=

x=12/3=

x=4

Answer 2

Respuesta:

x=2

y=3

Explicación paso a paso:

$2x+y=7\\\\2x+y-y=7-y\\\\2x=7-y\\\\\frac{2x}{2}=\frac{7}{2}-\frac{y}{2}\\\\x=\frac{7-y}{2}\\\\\begin{bmatrix}3\cdot \frac{7-y}{2}-y=3\end{bmatrix}\\\\3\cdot \frac{7-y}{2}-y=3\\\\3\cdot \frac{7-y}{2}-y\\\\=\frac{\left(7-y\right)\cdot \:3}{2}-\frac{y\cdot \:2}{2}\\\\=\frac{\left(7-y\right)\cdot \:3-y\cdot \:2}{2}\\\\=\frac{21-5y}{2}\\\\\begin{bmatrix}\frac{21-5y}{2}=3\end{bmatrix}\\\\\frac{21-5y}{2}=3\\\\\frac{2\left(21-5y\right)}{2}=3\cdot \:2\\\\21-5y=6\\\\21-5y-21=6-21$

$-5y=-15\\\\\frac{-5y}{-5}=\frac{-15}{-5}\\\\\frac{-5y}{-5}\\\\=\frac{5y}{5}\\\\=y\\\\\frac{-15}{-5}\\\\=\frac{15}{5}\\\\=3\\\\y=3\\\\x=\frac{7-3}{2}\\\\\frac{7-3}{2}\\\\=\frac{4}{2}\\\\=2\\\\x=2$