2. 外语
  3. If 3x + 4y=17 and 5x+2y=23, what is the value of x-y?

If 3x + 4y=17 and 5x+2y=23, what is the value of x-y?

admin2013-02-19  5
问题 If 3x + 4y=17 and 5x+2y=23, what is the value of x-y?
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答案3
解析 The correct answer is 3. In order to solve this system of equations, subtract the first equation from the second. The result is 2x - 2y = 6. Factor out 2 to get 2(x-y)= 6. Divide both sides by 2 to get x-y= 3.
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