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Otrada [13]
4 years ago
9

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

SAT
1 answer:
vovangra [49]4 years ago
6 0
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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