Answer:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!
Step-by-step explanation:
Answer:
-6/5
Step-by-step explanation:
Slope = (y2 - y1)/(x2 - x1)
Plug in
Slope = (4 + 2)/(-2 - 3)
Slope = -6/5
Answer:
Step-by-step explanation:
Let us assume there are n people in the group. If possible let each have different number of friends.
Number of friends can vary from 0 to n-1 only since no one is a friend of him- or herself, and friendship is symmetrical—if x is a friend of y then y is a friend of x.)
Now n people have friends as 0,1,2...n-1 such that each has distinct number of friends.
But say if A has 0 friends, it means A has no friend,
but there is one B who has n-1 friends i.e. all the others in the party are friends to him including A
This is a contradiction. So it follows in any group of people, two of them have the same number of friends in the group.
