I don't understand how to solve this, please help

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.

Match each inequality to the number line that represents its solution

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?