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受欢迎的代数 >

x-2y+7=0,x+y+2=0

解答

x - 2 y + 7 = 0, x + y + 2 = 0

解答

x = - \frac{11}{3}, y = \frac{5}{3}

求解步骤

[x - 2 y + 7 = 0 x + y + 2 = 0]

对于

x - 2 y + 7 = 0

将

x

移到一边:

x = 2 y - 7

替代

x = 2 y - 7

[2 y - 7 + y + 2 = 0]

化简

[3 y - 5 = 0]

对于

3 y - 5 = 0

将

y

移到一边:

y = \frac{5}{3}

对于

x = 2 y - 7

替代

y = \frac{5}{3}

x = 2 \cdot \frac{5}{3} - 7

2 \cdot \frac{5}{3} - 7 = - \frac{11}{3}

x = - \frac{11}{3}

方程组的解为:

x = - \frac{11}{3}, y = \frac{5}{3}

作图

流行的例子

4a-3b=5,3a-4b=2

4 a - 3 b = 5, 3 a - 4 b = 2

x + y = 40, x - 3 y = 20

7(y+3)-2(x+2)=14,4(y+2)+4(x+3)=44

7 (y + 3) - 2 (x + 2) = 14, 4 (y + 2) + 4 (x + 3) = 44

x/3+y/4 =6,+x/6+y/2 =6

\frac{x}{3} + \frac{y}{4} = 6, + \frac{x}{6} + \frac{y}{2} = 6

2x+y=31,3y-x=23

2 x + y = 31, 3 y - x = 23