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# How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method

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GMAT 1: 700 Q51 V31
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Re: How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method [#permalink]
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Re: How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method [#permalink]
In number 4 - why did you multiply 7 by (x-1)? I multiplied the whole left hand side of the expression by (x-1) to get rid of (x-1) in the denominator but it seems as if you kept the (x-1) in the denominator when you did so.
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Re: How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method [#permalink]
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Hi All,

GMAT Quant questions are typically designed in a way that allows the Test Taker more than one way to solve. In this article, the solutions are essentially all based on "doing algebra", but each of these questions can ALSO be solved by TESTing VALUES.

In many cases, TESTing VALUES is an easier and faster way to get to the correct answer, so beyond learning how to "do the math", you should also put in the proper time to learn (and practice) tactics. You'll find that it's easier to score at a higher level when you have more approaches to choose from.

GMAT assassins aren't born, they're made,
Rich
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Status:Tutor - BrushMyQuant
Posts: 1846
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Given Kudos: 100
Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 700 Q51 V31
GPA: 3
WE:Information Technology (Computer Software)
Re: How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method [#permalink]
Top Contributor
Yes we can multiply with x-1 on both the sides but since x-1 is negative so we need to make sure that we change the sign of the inequality once we multiply both sides with a negative number (i.e (x-1)). (I did not want to make the solution complex so i did not multiply both the sides with x-1.)
Hope it helps!
healthjunkie
In number 4 - why did you multiply 7 by (x-1)? I multiplied the whole left hand side of the expression by (x-1) to get rid of (x-1) in the denominator but it seems as if you kept the (x-1) in the denominator when you did so.
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Re: How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method [#permalink]
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Re: How to Solve: Inequality Problems - Algebra and Sine Wave/Wavy Method [#permalink]
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