Final answer:
The equation that describes the relationship between x and y in the given table is y = 4x - 1, found by using the x and y values where x=0 and y=-1.
Step-by-step explanation:
The student is asked to complete the equation y = 4x + [?] based on the values given in the table. To solve for the missing number in the equation, we can plug in the given values of x and y from the table and solve for the unknown. If we take the first pair from the table where x=0 and y=-1, we have -1 = 4(0) + b, which simplifies to -1 = b. Therefore, the complete equation that describes how x and y are related is y = 4x - 1.