Speakers loudness. Measured in decibel (dB) is inversely proportional to the listener from the speaker.
If the loudness is 20dB when the listener is 6 feet away from the speaker.
What is the loudness when the listener is 3 ft away from the speaker?​

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11