soo17 soo17
  • 21-07-2016
  • Mathematics
contestada

1/3x+y=9, -2x+2y= -6... what is x and y, using the substitution method?

Respuesta :

texaschic101
texaschic101 texaschic101
  • 21-07-2016
1/3x + y = 9
y = -1/3x + 9

-2x + 2y = -6
-2x + 2(-1/3x + 9) = -6
-2x - 2/3x + 18 = -6
-6/3x - 2/3x = -6 - 18
-8/3x = -24
x = -24 * -3/8
x = 9 <== here is y

-2x + 2y = -6
-2(9) + 2y = -6
-18 + 2y = -6
2y = -6 + 18
2y = 12
x = 12/2
x = 6 <=== here is x


Answer Link

Otras preguntas

Cowards die many times before their deaths. The valiant never taste of death but once. Of all the wonders that I yet have heard, It seems to me most strange tha
what is 940 divided by 58 please help I'm doing my brothers homework xD
What is the best estimate for 289 and 7
what was the difference between the french and the english in regards to exploration and colonization
What is additive inverse of 2 and -2
whats the least common factor of 20,44,88
What audience do the ad`s critics want to appeal to and why?
how does a digit in the ten thousand place compere to a digit in the thousand place
Which food prepared for Seder represents the bitterness of slavery?
Push ups focus on which muscle region of the body?