joypaark joypaark
  • 03-07-2017
  • SAT
contestada

If 5b=6a+16 and 9a=7b-20, then what is the value of 3a-2b?
A) -8
B) -4
C) 4
D) 8

Respuesta :

mergl
mergl mergl
  • 03-07-2017
B) -4
5b=6a+16
9a=7b-20
b=(6/5)a+(16/5)
9a=7((6/5)a+(16/5))-20
9a=(42/5)a+12/5
(3/5)a=12/5
a=4
5b=6(4)+16
5b=24+16
5b=40
b=8
3(4)-2(8)
12-16=-4
Answer Link

Otras preguntas

how to write 0.632 in wordform please show an example
Brandon owns nearly 2 times as many CDs ads Ingrid. Brandon owns 56 CDs. Write an equation and use it to estimate the number n of CDs Ingrid owns.
What's the square root of 98
What is the best estimate product for 289 and 7
theo had a balance of -$4 in his savings account. after making a deposit, he has $25 in his account. what is the overall change to his account?
Last summer, at Camp Okey-Fun-Okey, the radio of the number of boy campers to the number of girl campers was 8:7. If there were a total of 195 campers, how many
What effect did the Revenue Act of 1926 have on Americans?
is 8/5 rational or irrational?
how do solve 21s=3 ?
What does the fact the pi is irrational indicate about it'd decimal equivalent