If the sound level at a point is 115 dB, what is the intensity of sound at that point?
(Unit=W/m^2)

Here we have that the sound level at a point is 115dB so we want to know the intensity of sound at that point in , that is, we need to convert from Intensity expressed in dB to intensity expressed in . So:

an

y = 6x -3y -12

y +3y +12 = 6x

=> . x = { 2y / 3 +2 } this is equation of line in terms of x

=> . if line meets the x-axis the co-ordinates of meeting point would be ( x , 0 )

=> . x = 2 ( 0 ) / 3 + 2

=> . x = 2

so, the point is ( 2 , 0 )