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受欢迎的代数 >

-5x+4y=-3,8x+3y=-3

解答

- 5 x + 4 y = - 3, 8 x + 3 y = - 3

解答

x = - \frac{3}{47}, y = - \frac{39}{47}

求解步骤

[- 5 x + 4 y = - 3 8 x + 3 y = - 3]

对于

- 5 x + 4 y = - 3

将

x

移到一边:

x = - \frac{- 3 - 4 y}{5}

替代

x = - \frac{- 3 - 4 y}{5}

[8 (- \frac{- 3 - 4 y}{5}) + 3 y = - 3]

化简

[\frac{24 + 47 y}{5} = - 3]

对于

\frac{24 + 47 y}{5} = - 3

将

y

移到一边:

y = - \frac{39}{47}

对于

x = - \frac{- 3 - 4 y}{5}

替代

y = - \frac{39}{47}

x = - \frac{- 3 - 4 ( - \frac{39}{47} )}{5}

- \frac{- 3 - 4 ( - \frac{39}{47} )}{5} = - \frac{3}{47}

x = - \frac{3}{47}

方程组的解为:

x = - \frac{3}{47}, y = - \frac{39}{47}

作图

流行的例子

15x+10y=10,8x-10y=20

15 x + 10 y = 10, 8 x - 10 y = 20

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

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

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