2. 外语
  3. 8(y + x)= 12 4x - 3y = -22

8(y + x)= 12 4x - 3y = -22

admin2013-02-19  1
问题 8(y + x)= 12 4x - 3y = -22
选项
答案x=-5/2 y=4
解析 First, distribute the 8 to get 8y + 8x = 12. You can then multiply the second equation by -2 to isolate one of the variables, and rearrange the equations to line up the like terms:
8x + 8y = 12
-8x + 6y= 44
Add the equations together(note that the x terms cancel out):
14y = 56
y = 4
Now choose one of the original equations, substitute 4 for y, and solve for x.
8x + 8(4)= 12
8x + 32 = 12
8x = -20
x=
x=
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