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受欢迎的代数 >

3y-6x=9,2x+y=-2

解答

3 y - 6 x = 9, 2 x + y = - 2

解答

x = - \frac{5}{4}, y = \frac{1}{2}

求解步骤

[3 y - 6 x = 9 2 x + y = - 2]

对于

3 y - 6 x = 9

将

y

移到一边:

y = 3 + 2 x

替代

y = 3 + 2 x

[2 x + 3 + 2 x = - 2]

化简

[4 x + 3 = - 2]

对于

4 x + 3 = - 2

将

x

移到一边:

x = - \frac{5}{4}

对于

y = 3 + 2 x

替代

x = - \frac{5}{4}

y = 3 + 2 (- \frac{5}{4})

3 + 2 (- \frac{5}{4}) = \frac{1}{2}

y = \frac{1}{2}

方程组的解为:

x = - \frac{5}{4}, y = \frac{1}{2}

作图

流行的例子

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

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

-5x+2y=-17,4x-3y=22

- 5 x + 2 y = - 17, 4 x - 3 y = 22

5x-7y=34,6x+8y=8

5 x - 7 y = 34, 6 x + 8 y = 8

x+y+z=1,3x-y+2z=7,3x+y-z=23

x + y + z = 1, 3 x - y + 2 z = 7, 3 x + y - z = 23

x+y+z=6,2x-y+2z=6,x+y+z=-5

x + y + z = 6, 2 x - y + 2 z = 6, x + y + z = - 5