tiffanycoretta
tiffanycoretta tiffanycoretta
  • 24-01-2022
  • Mathematics
contestada

Solve by substitution
3x-4y=-4
y=2x-4

Solve by substitution 3x4y4 y2x4 class=

Respuesta :

watsonultra2
watsonultra2 watsonultra2
  • 24-01-2022

Answer:

x=4 and y=4

Step-by-step explanation:

From first function we have:

[tex] 3x - 4y = - 4 \\ 4y = 3x + 4[/tex]

And from the second one:

[tex]y = 2x - 4 \\ 4y = 8x - 16[/tex]

Substitute them:

[tex]4y = 3x + 4 \\ 4y = 8x - 16 \\ \\ 0 = - 5x + 20 \\ x = 4 \\ y = 4[/tex]

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