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 :

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

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