SOLUTION: the sum of two number is 45. three times the first number plus seven times the seconds 115. find the two number

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Question 966697: the sum of two number is 45. three times the first number plus seven times the seconds 115. find the two number
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=45 MULTIPLY BY -3 & ADD.
3X+7Y=115
-3X-3Y=-135
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4Y=-20
Y=-20/4
Y=-5 ANS
X-5=45
X=45+5
X=50 ANS.
PROOF:
3*50+7*-5=115
150-35=115
115=115