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  • 25-11-2019
  • Mathematics
contestada

3x - 2y = -2
–5z - 7y=1

Respuesta :

BasketballEinstein
BasketballEinstein BasketballEinstein
  • 27-11-2019

Answer:

[tex]\displaystyle [-\frac{16}{31}, \frac{7}{31}][/tex]

Step-by-step explanation:

{3x - 2y = −2

{–5x - 7y = 1

−2⁄7[–5x - 7y = 1]

{3x - 2y = −2

{1 3⁄7x + 2y = −2⁄7 >> New Equation

____________

[tex]\displaystyle \frac{4\frac{3}{7}x}{4\frac{3}{7}} = \frac{-2\frac{2}{7}}{4\frac{3}{7}} \\ \\[/tex]

[tex]\displaystyle x = -\frac{16}{31}[/tex][Plug this back into both equations above to get the y-coordinate of 7⁄31]; [tex]\displaystyle \frac{7}{31} = y[/tex]

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