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

In a particular redox reaction, clo2– is oxidized to clo4– and ag is reduced to ag. complete and balance the equation for this reaction in acidic solution. phas
What is the half-reaction that occurs at the cathode during the electrolysis of molten potassium bromide?
Amanda y Cristina ________(trabajar) en el examen.
In an isosceles triangle the base angles are congruent. True False
Suppose you wish to take a group of elderly people and train them to solve word puzzles. generalizing from the text, what method of training might be most benef
The nurse is performing a nutritional assessment on an 80-year-old patient. the nurse knows that physiologic changes can directly affect the nutritional status
How can the principle of overload be applied to a sport, such as tennis or basketball?
Evaluate. r-s/9 for r= 26 and s =8 Simplify your​ answer
The endosperm is a unique tissue to ______. 1.Animals 2.Plants 3.Fungi 4.All Of The Above
I don't know how to do this