Answer:
The difference of 8 times a number r and 12 is solved for a number r and is given by 
Step-by-step explanation:
Given problem is the difference of 8 times a number r and 12
It can be written as

To simplify the above expression :
8r-12

( using addition property of equality )

(using division property of equality )

Therefore 
Therefore the difference of 8 times a number r and 12 is solved for a number r and is given by 
The answer is x-18
Do need the complete answer of your question??
Answer:
x=4, y=-11. (4, -11).
Step-by-step explanation:
3x+2y=-10
5x+y=9
--------------
3x+2y=-10
-2(5x+y)=-2(9)
--------------------
3x+2y=-10
-10x-2y=-18
-----------------
-7x=-28
7x=28
x=28/7=4
5(4)+y=9
20+y=9
y=9-20=-11
Danny is 3*6=18
Beth is 9 years old