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受欢迎的代数 >

7x+3y=37,7x+y=31

解答

7 x + 3 y = 37, 7 x + y = 31

解答

x = 4, y = 3

求解步骤

[7 x + 3 y = 37 7 x + y = 31]

对于

7 x + 3 y = 37

将

x

移到一边:

x = \frac{37 - 3 y}{7}

替代

x = \frac{37 - 3 y}{7}

[7 \cdot \frac{37 - 3 y}{7} + y = 31]

化简

[37 - 2 y = 31]

对于

37 - 2 y = 31

将

y

移到一边:

y = 3

对于

x = \frac{37 - 3 y}{7}

替代

y = 3

x = \frac{37 - 3 \cdot 3}{7}

\frac{37 - 3 \cdot 3}{7} = 4

x = 4

方程组的解为:

x = 4, y = 3

作图

流行的例子

4x-x=2,x-54x-x=2x-5

4 x - x = 2, x - 54 x - x = 2 x - 5

5a-2b=11,3a+b=11

5 a - 2 b = 11, 3 a + b = 11

3x-2y=9, x/3-y/6 = 5/6

3 x - 2 y = 9, \frac{x}{3} - \frac{y}{6} = \frac{5}{6}

2 x - y = 12, 3 x + y = 3

2x+3y=7,(k-1)x+(k+1)y=3k-1

2 x + 3 y = 7, (k - 1) x + (k + 1) y = 3 k - 1