book Maths Puzzle Numerical Ability

find the domain of f(x)= 7 + sqrt(3x+21), express it using interval notion

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Could you please help me? I have been haveing serious problems with this equation.
y=4x+1
y=4x-3
It has to be solved useing elimination, or substitution. And i have tryed both. Could you please help? 8x^+16x=24