layshiab2 layshiab2
  • 15-09-2021
  • Mathematics
contestada

Solve the system by substitution.
y = -2x
y = -9x+21

Respuesta :

caylus
caylus caylus
  • 15-09-2021

Answer:

Step-by-step explanation:

[tex]\left\{\begin{array}{ccc}y&=&-2x\\y&=&-9x+21\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}y&=&-2x\\-2x&=&-9x+21\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}y&=&-2x\\9x-2x&=&21\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}7x&=&21\\y&=&-2x\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}x&=&3\\y&=&-6\\\end{array} \right.\\\\\\[/tex]

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