Answer:
√178
Step-by-step explanation:
Distance formula: 
Simply plug in your coordinates into the distance formula to find the distance between them.
I don't really know if this is correct but I think it is x+y+z=14
I can't help u bc u have to show the pic so post another one and put a pic
Answer:
No.
Step-by-step explanation:
No because if we substitute the given values into the equation they do not fit:
y = 7x
x = 1 and y = 4:
Left side = 4
right side = 7*1 = 7.