The equation given that we are to complete which will be describing how x and y are related is:
y = 2x + [?]
we will substitute when x =0 and y=7 into the equation and then solve for the unknown
7 = 2(0) + [?]
7 = 0 + [?}
7 = [?}
Therefore the unnkown is 7
Hence the equation is y =2x+7
you can check the the others using this: