SOLUTION: twice one number plus a second number is 42, and the first number minus the second number is -6, find the numbers.

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Question 226502: twice one number plus a second number is 42, and the first number minus the second number is -6, find the numbers.
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
"twice one number plus a second number is 42," ---> 2x+y=42 ---> y=-2x+42
"the first number minus the second number is -6" --> x-y=-6

x-y=-6
x-(-2x+42)=-6
x+2x-42=-6
3x=36
x=12 <---- first number
y=-2(12)+42=-24+42=18 <---- second number