Answer:

Step-by-step explanation:
Given the system of two equations:

Add these two equations (left side add to left side and right side add to right side):

Substitute
into the first equation:

Answer:
B
Step-by-step explanation:
your welcome!
It is 2. (4x - 1) which is false!
Answer:
Answer:
f(x) = - 4x + 4
Step-by-step explanation:
Step-by-step explanation:
A linear function has the form
f(x) = ax + b, thus
f(0) = a(0) + b = 4, that is
0 + b = 4 , hence b = 4
f(3) = 3a + b = - 8 ← substitute b = 4
3a + 4 = - 8 ( subtract 4 from both sides )
3a = - 12 ( divide both sides by 3 )
a = - 4, thus
f(x) = - 4x + 4