2. 外语
  3. For which values of x is 2x - 5 < -3x + 20?

For which values of x is 2x - 5 < -3x + 20?

admin2013-02-19  28
问题 For which values of x is 2x - 5 < -3x + 20?
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答案5 >x
解析 The first step in solving this problem is to isolate the variable on one side of the inequality:
-5 - 20 < -3x- 2x
-25 < -5x
5 >x
It is important to remember that when dealing with inequalities, multiplying or dividing by a negative number involves reversing the sign. In this case, both sides were divided by -5, so the sign changes from < to >.
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