Step-by-step explanation
To answer the question, we will have to test each of the function when x=4, y should give 10
For the first option y = 14 - x

for option 2: y=x+6

For option 3: y = 2 x + 3

For option 4: y = (2.5) x

Thus, the only one that could not be the function will be y = 2 x + 3