Question

método de sustitución ​

Answer 1

Respuesta:

2x - 4y = 9

3x + 7y = 5

$2x = 9 + 4y\\\\x=\frac{9+4y}{2}\\\\reemplazas$

$3x + 7y = 5\\\\3(\frac{9+4y}{2} ) +7y = 5\\\\\frac{27+12y}{2} + 7y = 5\\\\\frac{14y + 27 +12y}{2} = 5\\\\14y +27+12y = 5(2)\\26y +27 = 10\\26y = 10-27\\26y = -17\\y = -17/26\\y= -0.65$

reemplazas en "y"

2x - 4y = 9

2x - 4(-0.65) = 9

2x + 2.6  = 9

2x = 9 - 2.6

2x = 6.4

x = 6.4/2

x = 3.2

comprobación

2x - 4y = 9

2(3.2) - 4(-0.65) = 9

6.4 + 2.6 = 9

9 = 9

3x + 7y = 5

3(3.2) + 7(-0.65) = 5

9.6 - 4.55 = 5

5 = 5

Explicación paso a paso: