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受欢迎的代数 >

3x+y+1=0,2x-3y+8=0

解答

3 x + y + 1 = 0, 2 x - 3 y + 8 = 0

解答

x = - 1, y = 2

求解步骤

[3 x + y + 1 = 0 2 x - 3 y + 8 = 0]

对于

3 x + y + 1 = 0

将

x

移到一边:

x = \frac{- y - 1}{3}

替代

x = \frac{- y - 1}{3}

[2 \cdot \frac{- y - 1}{3} - 3 y + 8 = 0]

化简

[\frac{- 11 y - 2}{3} + 8 = 0]

对于

\frac{- 11 y - 2}{3} + 8 = 0

将

y

移到一边:

y = 2

对于

x = \frac{- y - 1}{3}

替代

y = 2

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

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

x = - 1

方程组的解为:

x = - 1, y = 2

作图

流行的例子

l*c*m=16,8h*c*f(c,h,a,b)=1,2a-b=60a+b

l \cdot c \cdot m = 16, 8 h \cdot c \cdot f (c, h, a, b) = 1, 2 a - b = 60 a + b

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

x/9+y/2 =3,0.6x-2y=2

\frac{x}{9} + \frac{y}{2} = 3, 0.6 x - 2 y = 2

f (x) = 2, x - e = 0

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