exam Maths Puzzle Numerical Ability

Solve each system by the substitution method:

#42
7y=9x
-3x=4y

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exam Other Question

For f(x)=√(x-3) and g(x)=x^3

a) the domain of f

b) the domain of g

c) (f-g)(x)

d) (fg)(x)

e) the domain of (f/g)(x) please help me solve x(x+5)=0 thank you so much