If x=3 and y=5 then you just substitute.
6(5)/3
30/3
=10
10 is your answer.
Given: 
A.)Consider
Also,
Since, 
Therefore, both functions are inverses of each other.
B.
For the Composition function 
Since, the function 
is not defined for 
.
Therefore, the domain is 
For the Composition function 
Since, the function 
is not defined for 
.
Therefore, the domain is 
3(3x+8)=4(2x+8)
9x+24=8x+32
x=8
2(8)=16
3(8)=24
that means that the younger brother is 16 years old
4x=20-8y
x=5-2y now use this value of x in the second equation...
3(5-2y)+6y=15
15-6y+6y=15
15=15 This is true for any y or x value.
So there are infinitely many solutions as the two equations describe the same line.
The length is 7 and there is no N
