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赵鑫 2022-08-12 20:44:27 +08:00
parent d780d0c626
commit 391986d7db

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@ -33,11 +33,7 @@ $ \begin{cases}x &+ &y &= 35 \newline 2x &+ &4y &= 94 \end{cases} $
$ x = 35-y $ $ x = 35-y $
$ (35-y) \times 2 + 4y = 94 $ $ \begin{aligned}(35-y) \times 2 + 4y &= 94 \newline 2y &= 24 \newline y &= 12 \end{aligned}$
$ 2y = 24 $
$ y = 12$
$ x = 35 - y = 23$ $ x = 35 - y = 23$