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受欢迎的代数 >

4x+3y=5,2x-y=2

解答

4 x + 3 y = 5, 2 x - y = 2

解答

x = \frac{11}{10}, y = \frac{1}{5}

求解步骤

[4 x + 3 y = 5 2 x - y = 2]

对于

4 x + 3 y = 5

将

x

移到一边:

x = \frac{5 - 3 y}{4}

替代

x = \frac{5 - 3 y}{4}

[2 \cdot \frac{5 - 3 y}{4} - y = 2]

化简

[\frac{5 - 5 y}{2} = 2]

对于

\frac{5 - 5 y}{2} = 2

将

y

移到一边:

y = \frac{1}{5}

对于

x = \frac{5 - 3 y}{4}

替代

y = \frac{1}{5}

x = \frac{5 - 3 \cdot \frac{1}{5}}{4}

\frac{5 - 3 \cdot \frac{1}{5}}{4} = \frac{11}{10}

x = \frac{11}{10}

方程组的解为:

x = \frac{11}{10}, y = \frac{1}{5}

作图

流行的例子

67x+108y=-417,108x+67y=-458

67 x + 108 y = - 417, 108 x + 67 y = - 458

2x+3y=4,3x-4y=23

2 x + 3 y = 4, 3 x - 4 y = 23

2 x + 3 y = 5, x + 3 y = 7

0.4b=1,2c=12.2,a=6

0.4 b = 1, 2 c = 12.2, a = 6

8/a-9/b =1,(10)/a+6/b =7

\frac{8}{a} - \frac{9}{b} = 1, \frac{10}{a} + \frac{6}{b} = 7