SOLUTION: twice one number added to another number is 18. four times the first number minus the other number is 12.find the number.

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Question 248818: twice one number added to another number is 18. four times the first number minus the other number is 12.find the number.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = "a number"
Let y = "another number"
:
Write an equation for what it says
:
"twice one number added to another number is 18."
2x + y = 18
:
" four times the first number minus the other number is 12"
4x - y = 12
:
find the number.
:
Use elimination, add the two equations
2x + y = 18
4x - y = 12
------------Addition eliminates y, find x
6x = 0 = 30
x = 30%2F6
x = 5
:
I'll let you find y now