Question

X - 2y= 7
3x+ y=7
ayudaaaaaa​

Answer 1

⚡Hello⚡

Resolver=

3{×-2y=7

3{×-2y=7-1{3×+y=7

3+-6y=21

-3×-y=-7

-7y=14

y=14/-7

Y=-2

×-2y=7

×-2(-2)=7

×+4=7

×=7-4

×=3

⚡Suerte⚡

Answer 2

$\huge\boxed{\bf{x-2y=7}} \\\huge\boxed{\bf{3x+y=7}}$

$\qquad \qquad\huge \underline{\boxed{\sf Metodo\ de\ sustitucion.}}$

$\mathtt{\purple{ \huge \underline{\fbox{\:\green{Procedimiento\red:\:}}}}}$

1. Despejar el valor x en la ecuación 1.  

${\boxed {\bold {x-2y=7}}}}}\\ {\boxed {\bold {x=7+2y}}}}}$

2. Sustituir el valor x en la ecuación 2.

${\boxed {\bold {3x+y=7}}}}}\\ {\boxed {\bold {3(7+2y)+y=7}}}}}\\ {\boxed {\bold {21+6y+y=7}}}}}\\ {\boxed {\bold {28y=7}}}}}\\ {\boxed {\bold {y=\frac{28}{7}}}}}}\\ {\boxed {\bold {y=4}}}}}$  

3. El valor y lo sustituimos en la ecuación 3.

${\boxed {\bold {x=7+2y}}}}}\\ {\boxed {\bold {x=7+2(4)}}}}}\\ {\boxed {\bold {x=7+8}}}}}\\ {\boxed {\bold {x=15}}}}}$

4. Verificación.

${\boxed {\bold {x-2y=7}}}}}\\ {\boxed {\bold {(15)-2(4)=7}}}}}\\ {\boxed {\bold {15-8=7}}}}}\\ {\boxed {\bold {7=7}}}}}$ ✓

Espero haberte ayudado, saludos!

Atte: ☞Miraculer18☜