exam Maths Puzzle Numerical Ability

Write a matrix equation for the system of equations:
5a+3b=6
2a-b=9

so I'm still working on it but is[x]= -1/11[-1-3]
[y] [-2 5] righ

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exam Other Question

Simplify the rational expression

21-7x/18-6x
I am trying to figure this equation out but I am doing it wrong. We do not have a text book to go by.
7x=36+4x
Thanks,
Brandon