Thursday, March 20, 2014

-2

In fact, we have to solve 2 inequalities simultaneously:


5x-3>-2  (1)


5x-3<12  (2)


Let's solve the first inequality:


5x-3>-2 


We'll add both sides the value 2. Because it's a positive value, the inequality remains unchanged.


5x-3+2>-2+2


5x-1>0


Let's add now the value 1, keeping unchanged the inequality:


5x>1


We'll divide by 5, both sides:


x>1/5 so x belongs to the interval (1/5 , +inf.)


Now, let's solve the second inequality:


5x-3<12


First, we'll move the the value -3, to the right side, by changing it's sign:


5x<12+3


5x<15


Now, we'll divide by 5:


x<3, so x belongs to the interval (-inf. , 3).


The common solution is the intersection of both intervals and we'll get the interval (1/5 , 3).

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