The formulas:

Expand the expression:

Plug the values into the expression:
I'm pretty sure it is.
If i'm wrong, I'm truly sorry
Answer:
the solution is the whole line y = -x + 7
Step-by-step explanation:
both equations are identical
2y = 14 - 2x
=> y = 7 - x
which is exactly the same information as y=-x+7
so, there is no single crossing point. they are exactly covering each other. what "remains" is simply the whole line.
Answer:
f(0)=6
Step-by-step explanation:
When representing function's values by set of ordered pairs, the first one correspond to the x value and the second to the image or "y" value.
When you read f(0) means "when x is 0" then the 6 is the value of the function or the image.