We can solve it using this method:
−3<x<5 all *-1 = 3>-x>-5 = -5<-x<3-7<y<9
We can sum the inequalities : -7-5<y-x<9+3 = -12<y-x<12
In the solution provided,the max value of y is taken as 9 whereas the min value of x is taken as -3.Is this a mistake in the question or we can ignore < and consider it as <= ?
To answer your question, you can ignore the "<" and consider it "<=": it makes no difference.
It is beyond a doubt that all our knowledge that begins with experience.
Kant , Critique of Pure Reason
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