exam Maths Puzzle Numerical Ability

This is the question. I do not understand how to figure this out. Thank you for your help.

Sue and Tom Wright are assistant professors at the local university. They each take ho

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3x - y _<_ 6
x _>_ 1
y _<_ 3

The lines under each side of the < and > are supposed to be totally under the < >, I just do not no how to do this. If a figure shows a graph of Y=(x-3)(x-a. Determine the value of a

Possible answers:
3
4
5
7

Please show me and a graph if you can.

Thank you