exam Maths Puzzle Numerical Ability

Hello
with the substitution how do i solve:

2x - y = 3
6x - 9 = 3y

thank you

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exam Other Question

Find the area of a rectangle.

Lenght: radical sign 3+ radical sign 5.
Width: radical sign 3+ radical sign 5 5/16y+3/8y=2+1/4y and also can u show me how to check it

thanks