Question

tim x,y \(\in\)N:

7x+12y=50

Answer 1

Ta có:7x+12y=50

7(x+y)+5y=50

7(x+y)=50-5y

7(x+y)=5(10-y)

\(\Rightarrow\hept{\begin{cases}x+y=5\\10-y=7\end{cases}}\)

\(\Rightarrow y=3\)

\(\Rightarrow x=2\)

Answer 2

x=2

y=3

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Answer 3

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