exam Maths Puzzle Numerical Ability

Please help me with this proof.

In the figure, angle NYR and angle RYA form a linear pair, angle AXY and angle AXZ form a linear pair, and angle RYA and angle AXZ are congruent.

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exam Other Question
the substitution method should be used to solve which system of equations

a.5x-7y=16
2x-7y=12

b.4x+3y=-5
6x-3y=2

c.x=3y+1
2x+y=7

d.2x+6y=3
3x+2y=-1 (~A -> ~C)
~(B . ~C)
(~B -> (T v S)) /:.(~T -> (~S -> A))