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

if the roots of a quadratic equation are 1±√5, then the product of the roots is
That some individuals are exceptionally intelligent in mathematical ability but have great difficulty understanding social interaction, lends support to which t
Explain, with supporting examples, whether or not viruses are alive.
A regular hexagon is inscribed inside a circle. the perimeter of the hexagon is 90 units. a.what is the approximate measure of the radius of the circle? b.what
I REALLY need help!!!!!
What is the GCF of 44j^5k^4 and 121j^2k^6?
How many unit tiles need to added to the expression x^2+4x+3 to form the perfect square trinomial?
In two or more complete sentences, describe Valdivia earthquake. In your description, include the following facts: A. length of the earthquake;B. aftershocks; a
Who designates the incident commander and the process for transferring command?
Factor the expression 54x+81 using gfc