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受欢迎的代数 >

5(x-2)+2y=-5,3(x+y)-8=2(y-2)

解答

5 (x - 2) + 2 y = - 5, 3 (x + y) - 8 = 2 (y - 2)

解答

x = 3, y = - 5

求解步骤

[5 (x - 2) + 2 y = - 5 3 (x + y) - 8 = 2 (y - 2)]

对于

5 (x - 2) + 2 y = - 5

将

x

移到一边:

x = \frac{- 5 - 2 y}{5} + 2

替代

x = \frac{- 5 - 2 y}{5} + 2

[3 (\frac{- 5 - 2 y}{5} + 2 + y) - 8 = 2 (y - 2)]

化简

[\frac{3 ( 3 y - 5 )}{5} - 2 = 2 (y - 2)]

对于

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

将

y

移到一边:

y = - 5

对于

x = \frac{- 5 - 2 y}{5} + 2

替代

y = - 5

x = \frac{- 5 - 2 ( - 5 )}{5} + 2

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

x = 3

方程组的解为:

x = 3, y = - 5

作图

流行的例子

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

2x-4y=36,4x+2y=82

2 x - 4 y = 36, 4 x + 2 y = 82

5a+b=21,2a+3b=24s

5 a + b = 21, 2 a + 3 b = 24 s

(x/5)+y+2=0,(x/3)-y-10=0

(\frac{x}{5}) + y + 2 = 0, (\frac{x}{3}) - y - 10 = 0

a = - 3, b = - 6, c = - 2