emilyy3 emilyy3
  • 12-01-2016
  • Mathematics
contestada

X= y-2
2x+3y=21
Solution_______

Respuesta :

Billymkhoi
Billymkhoi Billymkhoi
  • 12-01-2016
x= y-2

2x+3y=21
⇒ 2(y-2)+3y=21
⇒ 2y-4+3y= 21 (distributive property)
⇒ (2y+3y)-4= 21 (combine like terms)
⇒ 5y= 21+4
⇒ 5y= 25
⇒ y= 25/5
⇒ y= 5

The final answer is y=5~

Answer Link

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