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受欢迎的代数 >

2x-3y=15,3x+3y=40

解答

2 x - 3 y = 15, 3 x + 3 y = 40

解答

x = 11, y = \frac{7}{3}

求解步骤

[2 x - 3 y = 15 3 x + 3 y = 40]

对于

2 x - 3 y = 15

将

x

移到一边:

x = \frac{15 + 3 y}{2}

替代

x = \frac{15 + 3 y}{2}

[3 \cdot \frac{15 + 3 y}{2} + 3 y = 40]

化简

[\frac{45 + 15 y}{2} = 40]

对于

\frac{45 + 15 y}{2} = 40

将

y

移到一边:

y = \frac{7}{3}

对于

x = \frac{15 + 3 y}{2}

替代

y = \frac{7}{3}

x = \frac{15 + 3 \cdot \frac{7}{3}}{2}

\frac{15 + 3 \cdot \frac{7}{3}}{2} = 11

x = 11

方程组的解为:

x = 11, y = \frac{7}{3}

作图

流行的例子

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

2x+y+z=7,x-y-z=-4,3x+2y+z=10

2 x + y + z = 7, x - y - z = - 4, 3 x + 2 y + z = 10

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

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

y13=1,z13=10,0.03+j0.09=3.33-j10

y 13 = 1, z 13 = 10, 0.03 + j 0.09 = 3.33 - j 10

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

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