So we want to know what do we need to measure to determine the wavelength of the wave on the image. A wavelength is the distance between peaks of the wave. More generally, the distance on which the wave shape repeats. So on the image we need to measure X to determine the wavelength. So the correct answer is X.
        
             
        
        
        
Answer:
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Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Yes
Step-by-step explanation:
To find the y intercept of this formula, you first need to convert it into slope intercept form. 
x+y=1
y=-x+1
Here, the slope is negative 1 and the y intercept is (0,1). If you imagine the line with a slope of negative 1, it will indeed cross the x axis at (1,0). Hope this helps!