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受欢迎的代数 >

2x+5y=3,3x+3y=19

解答

2 x + 5 y = 3, 3 x + 3 y = 19

解答

x = \frac{86}{9}, y = - \frac{29}{9}

求解步骤

[2 x + 5 y = 3 3 x + 3 y = 19]

对于

2 x + 5 y = 3

将

x

移到一边:

x = \frac{3 - 5 y}{2}

替代

x = \frac{3 - 5 y}{2}

[3 \cdot \frac{3 - 5 y}{2} + 3 y = 19]

化简

[\frac{9 - 9 y}{2} = 19]

对于

\frac{9 - 9 y}{2} = 19

将

y

移到一边:

y = - \frac{29}{9}

对于

x = \frac{3 - 5 y}{2}

替代

y = - \frac{29}{9}

x = \frac{3 - 5 ( - \frac{29}{9} )}{2}

\frac{3 - 5 ( - \frac{29}{9} )}{2} = \frac{86}{9}

x = \frac{86}{9}

方程组的解为:

x = \frac{86}{9}, y = - \frac{29}{9}

作图

流行的例子

2 x - y = 1, 1 x + y = 10

x-y+z=-9,4x+2y-z=8,-2x+4y-z=38

x - y + z = - 9, 4 x + 2 y - z = 8, - 2 x + 4 y - z = 38

2x+3y=6,3x-5 y/2 =2

2 x + 3 y = 6, 3 x - 5 \frac{y}{2} = 2

4x+5y=19,5x-6y=-7

4 x + 5 y = 19, 5 x - 6 y = - 7

3x^5y=29,5x^5y=35

3 x^{5} y = 29, 5 x^{5} y = 35