2. 外语
  3. 8(y+x)=12 4x-3y=-22

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

admin2011-03-08  50
问题 8(y+x)=12      4x-3y=-22
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答案 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. [*]
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