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 \(7x-5\) may not be equal to zero and that therefore \(x={{5}\over{7}}\) is not a solution.
We now distinguish two cases, namely \(7x-5>0\) and \(7x-5<0\).
In both cases we multiply the inequality on both sides by \(7x-5\) because we then get a linear inequality, for which we know there is a solution method.
Suppose \(7x-5>0\), i.e. \(x> {{5}\over{7}}\). Then we get \(1<-5(7x-5)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(35x<24\).
Then, dvision by the coefficient of \(x\)gives \(x < {{24}\over{35}}\).
So we have the following system of inequalities: \(x> {{5}\over{7}}\,\wedge\; x < {{24}\over{35}}\)
and this simplifies to \(\text{an empty solution set}\).
Suppose \(7x-5<0\), i.e. \(x< {{5}\over{7}}\). Then we get \(1>-5(7x-5)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(35x>24\).
Then, division by the coefficient of \(x\) gives \(x > {{24}\over{35}}\).
So we have the following system of inequalities: \(x< {{5}\over{7}}\,\wedge\; x > {{24}\over{35}}\)
and this simplifies to \({{24}\over{35}}\lt x\lt {{5}\over{7}}\).
The solution of the original inequality is \({{24}\over{35}}\lt x\lt {{5}\over{7}}\).