Which graphed matches the equation ? y+6x = 3/4(x + 4)

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

This is different from the first one can someone me

Which representation has a constant of variation of -2.5