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受欢迎的代数 >

-21n+3y=6,3n-3y=3

解答

- 21 n + 3 y = 6, 3 n - 3 y = 3

解答

y = - \frac{3}{2}, n = - \frac{1}{2}

求解步骤

[- 21 n + 3 y = 6 3 n - 3 y = 3]

对于

- 21 n + 3 y = 6

将

n

移到一边:

n = - \frac{2 - y}{7}

替代

n = - \frac{2 - y}{7}

[3 (- \frac{2 - y}{7}) - 3 y = 3]

化简

[\frac{- 6 - 18 y}{7} = 3]

对于

\frac{- 6 - 18 y}{7} = 3

将

y

移到一边:

y = - \frac{3}{2}

对于

n = - \frac{2 - y}{7}

替代

y = - \frac{3}{2}

n = - \frac{2 - ( - \frac{3}{2} )}{7}

- \frac{2 - ( - \frac{3}{2} )}{7} = - \frac{1}{2}

n = - \frac{1}{2}

方程组的解为:

y = - \frac{3}{2}, n = - \frac{1}{2}

作图

流行的例子

y = - 3, x = 7

3x-2y=6,2x-3y=2

3 x - 2 y = 6, 2 x - 3 y = 2

3 x/5+3=5, x/9 =3

3 \frac{x}{5} + 3 = 5, \frac{x}{9} = 3

3x-7y+10=0,y-3x-3=0

3 x - 7 y + 10 = 0, y - 3 x - 3 = 0

3x+y=3,2x+2/3 y=2

3 x + y = 3, 2 x + \frac{2}{3} y = 2