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受欢迎的代数 >

2a+3b=16,2a+8b=26

解答

2 a + 3 b = 16, 2 a + 8 b = 26

解答

a = 5, b = 2

求解步骤

[2 a + 3 b = 16 2 a + 8 b = 26]

对于

2 a + 3 b = 16

将

a

移到一边:

a = \frac{16 - 3 b}{2}

替代

a = \frac{16 - 3 b}{2}

[2 \cdot \frac{16 - 3 b}{2} + 8 b = 26]

化简

[16 + 5 b = 26]

对于

16 + 5 b = 26

将

b

移到一边:

b = 2

对于

a = \frac{16 - 3 b}{2}

替代

b = 2

a = \frac{16 - 3 \cdot 2}{2}

\frac{16 - 3 \cdot 2}{2} = 5

a = 5

方程组的解为:

a = 5, b = 2

作图

流行的例子

x - y = 2, 2 x + y = 8

7x-2y=20,11x+15y+23=0

7 x - 2 y = 20, 11 x + 15 y + 23 = 0

2x+3y=13,x-5y=-13

2 x + 3 y = 13, x - 5 y = - 13

x - y = 5, 2 x + 3 y = 10

3x+4y=14,2x+5y=21

3 x + 4 y = 14, 2 x + 5 y = 21