4x + y = 7
y = -4x + 7
using y = mx + b
b being your y intercept, (0,7)
Answer:
D. 
Step-by-step explanation:
The period of the functions
is 
The period of the function
is ALWAYS 
In your case, you have function
and this function has the period

You need to find the function that will have the period that is half of
so

So, correct choice is

Answer: 78
Step by step: congruent side