zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

2x+3y=9,-x+y=-2

解答

2 x + 3 y = 9, - x + y = - 2

解答

x = 3, y = 1

求解步骤

[2 x + 3 y = 9 - x + y = - 2]

对于

2 x + 3 y = 9

将

x

移到一边:

x = \frac{9 - 3 y}{2}

替代

x = \frac{9 - 3 y}{2}

[- \frac{9 - 3 y}{2} + y = - 2]

化简

[\frac{- 9 + 5 y}{2} = - 2]

对于

\frac{- 9 + 5 y}{2} = - 2

将

y

移到一边:

y = 1

对于

x = \frac{9 - 3 y}{2}

替代

y = 1

x = \frac{9 - 3 \cdot 1}{2}

\frac{9 - 3 \cdot 1}{2} = 3

x = 3

方程组的解为:

x = 3, y = 1

作图

流行的例子

2 x - y = 0, x + y = 15

8^x=2^{y+1},5^y=25^{x+1}

8^{x} = 2^{y + 1}, 5^{y} = 2 5^{x + 1}

5x_{1}+7x_{2}=3,2x_{1}+4x_{2}=1

5 x_{1} + 7 x_{2} = 3, 2 x_{1} + 4 x_{2} = 1

2y-x=-9,7y-2x=3

2 y - x = - 9, 7 y - 2 x = 3

3x+5y=38,3x-y=-4

3 x + 5 y = 38, 3 x - y = - 4