(4,8), (1,y)

Question

The graph of a proportional relationship passes through the given points find y.

Answer 1

A proportional relationship means that y = kx.  

 

From the 1st point we know that 8 = 4k, so k = 2.  

 

So in the 2nd point y = 2x = 2 * 1 = 2, so y = 2.