The sum of two numbers is 25. One number is twice the second number plus seven. What are the two numbers? Use the process of elimination to solve.

Question

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Answer 1

x+y=25 => x=-y+25

x= 2y+7

x=-y+25

x=2y+7

subtract the first equation from the 2nd

0=3y-18

y=6

x=19