book Maths Puzzle Numerical Ability

hello, i need help with this problem; find any values for which

2y+3
-------- is undefined.
y^2-6y+5

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book Other Question
In the linear transformations R3->R3, I want to know how the following cases look like graphically;
1) Rank=zero, Nullity=3
2) Rank=2, and Nullity=1,
I know for 1), they are a p solve using the addition method.

#1

x+y=4
2x-y=5

#2

x+2y=9
3x-2y=-5

#3

x-y=8
2x+y=7

#4

2x+3y=-5
3x-y=-13

#5

2x+3y=8
5x+2y=-2

#6

5x-2y=2
3x