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受欢迎的代数 >

(4)3x-y-2=0,2x+y=8

解答

(4) 3 x - y - 2 = 0, 2 x + y = 8

解答

x = \frac{5}{7}, y = \frac{46}{7}

求解步骤

[(4) \cdot 3 x - y - 2 = 0 2 x + y = 8]

对于

(4) 3 x - y - 2 = 0

将

x

移到一边:

x = \frac{y + 2}{12}

替代

x = \frac{y + 2}{12}

[2 \cdot \frac{y + 2}{12} + y = 8]

化简

[\frac{7 y + 2}{6} = 8]

对于

\frac{7 y + 2}{6} = 8

将

y

移到一边:

y = \frac{46}{7}

对于

x = \frac{y + 2}{12}

替代

y = \frac{46}{7}

x = \frac{\frac{46}{7} + 2}{12}

\frac{\frac{46}{7} + 2}{12} = \frac{5}{7}

x = \frac{5}{7}

方程组的解为:

x = \frac{5}{7}, y = \frac{46}{7}

作图

流行的例子

3x+4y=20,2x-3y=2

3 x + 4 y = 20, 2 x - 3 y = 2

2x+7y-3=5,x+4y+6=0

2 x + 7 y - 3 = 5, x + 4 y + 6 = 0

7x-4y=5,3x-2y=1

7 x - 4 y = 5, 3 x - 2 y = 1

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

w(x,z,y)+x+z=5,y+z=8,x+z=2

w (x, z, y) + x + z = 5, y + z = 8, x + z = 2