Question

3- Aplica el método de SUSTITUCIÓN
a) {x +3y = 6
5x −2y = 13
b) {5x +7y = −1
−3x +4y = −24
c) {4y +3x = 8
8x −9y = −77
d) {x −5y = 8
−7x +8y = 25

No poner estupideces por favor

Answer 1

Respuesta:

$x - 3y = 6\\5x - 2y = 13\\Despejamos x en estas dos ecuaciones , para hallar y :\\5 ( - 6 + 3y ) = 1 ( - 13 + 2y )\\ - 30 + 15y = - 13 + 2y\\15y - 2y = - 13 + 30\\13y = 17\\y = 17 / 13\\y = 1.30769\\Hallamos x :\\1ra e : x = 6 - 1.30769\\x = 4.69231\\2da e : 5x = 13 - 1.30769\\5x = 11.69231\\x = 11.69231\\4ta e : - 3x = - 24 - 1.30769\\\\- 3x = - 25.30769\\x = - 25.30769 / - 3\\x = 8.43589\\3ra e : 5x = - 1 - 1.30769\\5x = - 2.30769\\x = - 2.30769 / 5\\x = - 0.46153$

Explicación paso a paso: 5ta e : 3x = 8 - 1.30769

3x = 6.69231

x = 6.69231 / 3

x = 2.23077

6ta e : 8x = - 77 - 1.30769

8x = - 78.30769

x = - 78.30769 / 8

x = - 9.78846

7ma e : x = 8 - 1.30769

x = 6.69231

8va e: - 7x = 25 - 1.30769

- 7x = 23.69231

x = 23.69231 / - 7

x = - 3.38461