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OpenStudy (anonymous):
Twice a first number plus a second number is 42, and the first number minus the second number is -6. Find the number.
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OpenStudy (anonymous):
mabae 36 i dont know
Directrix (directrix):
Let F be the first number Let S be the second number 2F + S = 42 F - S = -6 ----------- Solve those equations simultaneously. If you are allowed to use online technology, click here: http://www.wolframalpha.com/input/?i=2F+%2B+S+%3D+42%2C+F+-+S+%3D+-6 It appears that the F = 12 and S = 18. Check that to be sure. @ohsnapitzmekathymcgee
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