What’s the answer to these??

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10