kendall7382 kendall7382
  • 18-11-2021
  • Mathematics
contestada

please beo me solve the equation substitution

please beo me solve the equation substitution class=

Respuesta :

tryingtopasshere
tryingtopasshere tryingtopasshere
  • 18-11-2021

Answer:

[tex]\left \{ {{x=3} \atop {y=-4}} \right.[/tex]

Step-by-step explanation:

[tex]\left \{ {{5x + 2y =7} \atop {4x + y =8}} \right.[/tex]

[tex]\left \{ {{5x + 2y = 7} \atop {2(4x + y) = 8 x 2}} \right.[/tex]

[tex]\left \{ {{5x + 2y = 7} \atop {8x + 2y = 16}} \right.[/tex]

5x + 2y - (8x +2y) = 7 - 16

5x + 2y - 8x +2y = 7 - 16

5x - 8x = 7 - 16

x= 3

5 × 3 + 2y = 7

y = -4

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