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受欢迎的代数 >

a+4b=9,5a+4b=29

解答

a + 4 b = 9, 5 a + 4 b = 29

解答

a = 5, b = 1

求解步骤

[a + 4 b = 9 5 a + 4 b = 29]

对于

a + 4 b = 9

将

a

移到一边:

a = 9 - 4 b

替代

a = 9 - 4 b

[5 (9 - 4 b) + 4 b = 29]

化简

[45 - 16 b = 29]

对于

45 - 16 b = 29

将

b

移到一边:

b = 1

对于

a = 9 - 4 b

替代

b = 1

a = 9 - 4 \cdot 1

化简

a = 5

方程组的解为:

a = 5, b = 1

作图

流行的例子

y = 0, y = - 1

x-1/3*y=1,2x-y=-2

x - \frac{1}{3} \cdot y = 1, 2 x - y = - 2

3x+4y=2,4x+3y=4

3 x + 4 y = 2, 4 x + 3 y = 4

x + y = 1, 2 x - y = 2

x + y = 1, 2 x - y = 8