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1 and 2 conditions state the same: each notepad costs less than $1
A) Let a notepad costs 0.00001$ and a marker costs 0.00001$. It this case we can buy 4 notepads and 4 markers instead. B) Let a notepad costs 0.00001$ and a marker costs 9.9/3=3.3$. It this case we cannot buy 4 notepads and 4 markers instead.
Both statement 1 and statement 2 tell you about the max price of x (notebook).
Neither one of them gives any indication around the max price for y (marker). As a result, even when you use both statements together, you cannot determine the max price for the marker. That's where you are making a mistake.
If the marker is $1, then it true. If the marker is $1.83 as I showed in my example, then false.