2. 外语
  3. x- 2y = 14 x- 4y = -8

x- 2y = 14 x- 4y = -8

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问题 x- 2y = 14 x- 4y = -8
选项
答案x= 36 y= 11
解析 When solving systems of equations, the best thing to do first is to isolate one of the variables. In this problem, you can do so by changing the sign on the bottom equation:
x - 2y = 14
-x + 4y = 8
Add the two equations together(note that the x terms cancel out):
2y= 22
y= 11
Choose one of the original equations and substitute 11 in for y. Solve for x:
x- 2(11)= 14
x- 22 = 14
x= 36
It is a good idea to test your answers by substituting x and y values into both of the original equations.
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