zanaplen27
zanaplen27 zanaplen27
  • 18-04-2019
  • Mathematics
contestada

If 8a−4b=20 and 4a−8b=4, then what is the value of a−b?

Respuesta :

lana4639
lana4639 lana4639
  • 18-04-2019

1/2

-2(4a-8b=4)

=

-8a+16b=8

+8a-4b=2

——————

0+12b=-6

/12. /12

B= -1/2

Plug it in

4a-8(-1/2)= 4

4a+4=4

-4. -4

4a=0

/4. /4

A=o

Finish by plugging a and b in for the last part

0-(-1/2)

= 1/2

Answer Link

Otras preguntas

go follow my meme page on Insta gram please I just started it Username is shawty.tedo Also I hope you have a wonderful day today and get all your work done. I
It was all in Sophie Cardona's imagination. Is this a fragment or a complete sentence??? HELP!!
Help on this? .......................
1. What is the military-industrial complex? -The partnership between big business and the U.S. armed forces that created a permanent war economy. -The balance b
The smallest 3-digit number with distinct digits is ​
What would be the construction of a major scale,starting on note G?
What is the final amount if 672 is decreased by 12% followed by a further 5% decrease? Give your answer rounded to 2 DP.
PLEASE HELP DESPERATE NEED DUE IN 2 MINS.
AC – AB = AB is this true or false?
Need help with this