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受欢迎的代数 >

2a+b=-1,3a-4b=15

解答

2 a + b = - 1, 3 a - 4 b = 15

解答

a = 1, b = - 3

求解步骤

[2 a + b = - 1 3 a - 4 b = 15]

对于

2 a + b = - 1

将

a

移到一边:

a = \frac{- 1 - b}{2}

替代

a = \frac{- 1 - b}{2}

[3 \cdot \frac{- 1 - b}{2} - 4 b = 15]

化简

[\frac{- 3 - 11 b}{2} = 15]

对于

\frac{- 3 - 11 b}{2} = 15

将

b

移到一边:

b = - 3

对于

a = \frac{- 1 - b}{2}

替代

b = - 3

a = \frac{- 1 - ( - 3 )}{2}

\frac{- 1 - ( - 3 )}{2} = 1

a = 1

方程组的解为:

a = 1, b = - 3

作图

流行的例子

5x+3y=18,3x-y=2

5 x + 3 y = 18, 3 x - y = 2

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

4x+2y=7,3x-5y=-24

4 x + 2 y = 7, 3 x - 5 y = - 24

2x+3y-11=4,x-3y+5=0

2 x + 3 y - 11 = 4, x - 3 y + 5 = 0

4x-3y=19,2x+3y=23

4 x - 3 y = 19, 2 x + 3 y = 23