Megoldás - Linear inequalities with one unknown
Lépésről lépésre magyarázat
1. Cseréld fel az oldalakat
Swap sides:
2. Csoportosítsd az összes konstans tagot az egyenlőtlenség jobb oldalára
Subtract from both sides:
Csoportosítsd az azonos tagokat:
Egyszerűsítsd a számtani műveletet:
Egyszerűsítsd a számtani műveletet:
3. Izoláld a(z) n változót
Multiply both sides by :
Csoportosítsd az azonos tagokat:
Szorozd össze az együtthatókat:
Egyszerűsítsd a törtet:
Egyszerűsítsd a számtani műveletet:
4. Plot the solution on a coordinate grid
Solution:
Interval notation:
Miért érdemes ezt megtanulni
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Inequalities help us understand how systems work by setting boundaries. For example, a speed limit of 30 miles per hour does not mean we have to drive exactly 30 miles per hour and, instead, establishes a boundary for what is allowable — drive more than 30 miles per hour and risk getting a ticket. This could be modelled mathematically as .
There are also situations where there is more than one boundary. In our speed limit example, there may also be a lower speed limit of 15 miles per hour to prevent drivers from driving too slowly. The two boundaries together could be modelled mathematically as , in which represents all of the possible values between or equal to 15 and/or 30.
Furthermore, anytime we say something along the lines of, "it will take at least twenty minutes to get there," or "the car can hold five people at most," we are expressing the numerical boundaries of something and, therefore, speaking in terms of inequalities.