Angie was given the system of equations. Angie's work is shown in the table. 7x +y = - 12 7x + 4y = -6 Steps 1 Angie's Work --1 (77 + y = -12) -70 -76 = y = 12 72 + 4y = -6 Y = 12 2 3y = 6 Y = 2 -7 (2) - y = 12 -14 - y = 12 3 -Y = 26 Y = -26 4 The solution is (-2,2) Where did Angie make an error? Justify your answer.​

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function. a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.