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受欢迎的代数 >

5x+10y=28,15x=20y-121

解答

5 x + 10 y = 28, 15 x = 20 y - 121

解答

x = - \frac{13}{5}, y = \frac{41}{10}

求解步骤

[5 x + 10 y = 28 15 x = 20 y - 121]

对于

5 x + 10 y = 28

将

x

移到一边:

x = \frac{28 - 10 y}{5}

替代

x = \frac{28 - 10 y}{5}

[15 \cdot \frac{28 - 10 y}{5} = 20 y - 121]

化简

[3 (- 10 y + 28) = 20 y - 121]

对于

3 (- 10 y + 28) = 20 y - 121

将

y

移到一边:

y = \frac{41}{10}

对于

x = \frac{28 - 10 y}{5}

替代

y = \frac{41}{10}

x = \frac{28 - 10 \cdot \frac{41}{10}}{5}

\frac{28 - 10 \cdot \frac{41}{10}}{5} = - \frac{13}{5}

x = - \frac{13}{5}

方程组的解为:

x = - \frac{13}{5}, y = \frac{41}{10}

作图

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