Substitute the coordinates of points to the equation.


Answer:
the top one
because identity of addition is adding 0
2a + 4 - 7a + a
2a -7a +a +4
-5a + a +4
-4a + 4
-4a + 4 is your answer
hope this helps
It’s f(0)=3 because f(0) just means y intercept which is 3