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受欢迎的代数 >

f(x)=2,7f(x)=3x-9

解答

f (x) = 2, 7 f (x) = 3 x - 9

解答

x = \frac{23}{3}, f = 2

求解步骤

[f = 2 7 f = 3 x - 9]

替代

f = 2

[7 \cdot 2 = 3 x - 9]

化简

[14 = 3 x - 9]

对于

14 = 3 x - 9

将

x

移到一边:

x = \frac{23}{3}

方程组的解为:

x = \frac{23}{3}, f = 2

作图

流行的例子

2x+3y=51,1x-5y=6

2 x + 3 y = 51, 1 x - 5 y = 6

5/3 y= 34/3 ,x=2

\frac{5}{3} y = \frac{34}{3}, x = 2

11/3*x+3/4*y= 5/12 , 7/6*x+1/5*y-5/30 =0

\frac{11}{3} \cdot x + \frac{3}{4} \cdot y = \frac{5}{12}, \frac{7}{6} \cdot x + \frac{1}{5} \cdot y - \frac{5}{30} = 0

2 x + y = 8, 4 x - y = 10

x+2y=13,3x+y=14

x + 2 y = 13, 3 x + y = 14