exam Maths Puzzle Numerical Ability

I need help graphing Y=log subscript 2 x-3

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exam Other Question

What are the steps to solving a system using substitution. example:

y=x+2 y=2x-1.
The second of two numbers is 3 more than the first. If 4 times the first is increased by the second, the result is 73. Find the numbers.