Question 554064
 "The difference between two numbers is 10.The greater number is 4 more then twice the lesser number.Find the two numbers" 
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x + y = 10
x = 2y + 4
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Sub for x in the 1st eqn
(2y+4) + y = 10
3y + 4 = 10
3y = 6
y = 2
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x = 8