Solving equations and inequalities: Linear inequalities in one unknown
Reduction to a linear inequality
In some cases, you can reduce complicated inequalities to linear inequalities.
We note first that division by zero is not allowed and that for this reason \(9x-4\) may not be equal to zero and that therefore \(x={{4}\over{9}}\) is not a solution.
We now distinguish two cases, namely \(9x-4>0\) and \(9x-4<0\).
In both cases we multiply the inequality on both sides by \(9x-4\) because we then get a linear inequality, for which we know there is a solution method.
Suppose \(9x-4>0\), i.e. \(x> {{4}\over{9}}\). Then we get \(8<-2(9x-4)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(18x<0\).
Then, dvision by the coefficient of \(x\)gives \(x < 0\).
So we have the following system of inequalities: \(x> {{4}\over{9}}\,\wedge\; x < 0\)
and this simplifies to \(\text{an empty solution set}\).
Suppose \(9x-4<0\), i.e. \(x< {{4}\over{9}}\). Then we get \(8>-2(9x-4)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(18x>0\).
Then, division by the coefficient of \(x\) gives \(x > 0\).
So we have the following system of inequalities: \(x< {{4}\over{9}}\,\wedge\; x > 0\)
and this simplifies to \(0\lt x\lt {{4}\over{9}}\).
The solution of the original inequality is \(0\lt x\lt {{4}\over{9}}\).