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受欢迎的代数 >

10a+2b=4,15a-5b=-2

解答

10 a + 2 b = 4, 15 a - 5 b = - 2

解答

a = \frac{1}{5}, b = 1

求解步骤

[10 a + 2 b = 4 15 a - 5 b = - 2]

对于

10 a + 2 b = 4

将

a

移到一边:

a = \frac{2 - b}{5}

替代

a = \frac{2 - b}{5}

[15 \cdot \frac{2 - b}{5} - 5 b = - 2]

化简

[- 8 b + 6 = - 2]

对于

- 8 b + 6 = - 2

将

b

移到一边:

b = 1

对于

a = \frac{2 - b}{5}

替代

b = 1

a = \frac{2 - 1}{5}

化简

a = \frac{1}{5}

方程组的解为:

a = \frac{1}{5}, b = 1

作图

流行的例子

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

x+812x-4y=-32,y=3

x + 812 x - 4 y = - 32, y = 3

4x+5y=52,3x+10y=64

4 x + 5 y = 52, 3 x + 10 y = 64

3x+2y=10,12x+8y=30

3 x + 2 y = 10, 12 x + 8 y = 30

a + b = 20, a = 30