exam Maths Puzzle Numerical Ability

Could you please solve by using sustitution method. Please show details.
Thank you.

x - y = 3
3x - 2y = 3

Also please tell if it is independent, inconsistent or dependent.

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exam Other Question

Please help-I am so confused! Thank you for your help!

Find the indicated composite for the pair of functions.
(g*f)(x): f(x)=x-3/6, g(x)=6x+3 Could you please help me solve this problem? It is:
tan2x = 1 - secx