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受欢迎的代数 >

63x-5y=4,2y+7=9x

解答

63 x - 5 y = 4, 2 y + 7 = 9 x

解答

x = - \frac{1}{3}, y = - 5

求解步骤

[63 x - 5 y = 4 2 y + 7 = 9 x]

对于

63 x - 5 y = 4

将

x

移到一边:

x = \frac{4 + 5 y}{63}

替代

x = \frac{4 + 5 y}{63}

[2 y + 7 = 9 \cdot \frac{4 + 5 y}{63}]

化简

[2 y + 7 = \frac{4 + 5 y}{7}]

对于

2 y + 7 = \frac{4 + 5 y}{7}

将

y

移到一边:

y = - 5

对于

x = \frac{4 + 5 y}{63}

替代

y = - 5

x = \frac{4 + 5 ( - 5 )}{63}

\frac{4 + 5 ( - 5 )}{63} = - \frac{1}{3}

x = - \frac{1}{3}

方程组的解为:

x = - \frac{1}{3}, y = - 5

作图

流行的例子

4a+3b=14,3a-4b=23

4 a + 3 b = 14, 3 a - 4 b = 23

3 x + y = 8, 6 x + y = 7

x-2y=2,-x+2y=-2y

x - 2 y = 2, - x + 2 y = - 2 y

5x+2 y/3 =1,2x+y/2 =1

5 x + 2 \frac{y}{3} = 1, 2 x + \frac{y}{2} = 1

2x-3y=0,3x+y=10

2 x - 3 y = 0, 3 x + y = 10