Every input(x) has only one output(y)
Emily and Marie can’t have the same birthday in this so it’s not a function
40,000 divided by 10 is 4,000
Is this what you’re looking for
y=-2/5x+3/5
The answer to a divisionproblem
You can go full 2π rotate around counterclockwise so the angle wouldn't be negative.
So -π/2 + 2π = -π/2 + 4π/2 = 3π/2
So (4, 3π/2) is the same point as (4, -π/2)
