im tired of ppl giving me wrong answers. Please will somebody help! ill give brailiest as long as i get full answers and explanations for questions 1, 2, and 3 that are shown in photo.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Landon wrote that 3−2.6=4. which statement about his answer is true?

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.