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Anuta_ua [19.1K]
3 years ago
11

What is the solution x+2y=7 and x-2y=-1

Mathematics
1 answer:
erica [24]3 years ago
7 0

\underline{+\left\{\begin{array}{ccc}x+2y=7\\x-2y=-1\end{array}\right}\qquad\text{add both sides of the equations}\\\\.\qquad\qquad2x=6\qquad\text{divide both sides by 2}\\.\qquad\qquad \boxed{x=3}\\\\\text{Put the value of x to the first equation}\\\\3+2y=7\qquad\text{subtract 3 from both sides}\\\\2y=4\qquad\text{divide both sides by 2}\\\\\boxed{y=2}\\\\Answer:\ \boxed{x=3\ and\ y=2\to(3,\ 2)}

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Answer:

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Step-by-step explanation:

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_____

If you need an equation, you can use k as the constant of proportionality. Then the sum of differences described is ...

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  3k = 12 . . . . simplify

  k = 4 . . . . . . divide by 3

  5k = 5·4 = 20 . . . . . number of green pencils

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