HEL Old Navy is having a sale with 15% off all winter coats. The expression below can be used to find the discounted price, in dollars, of a coat whose original price is expressed as c.
1c - 0.15c
Which of the following expressions shows an equivalent way to determine the discounted price, in dollars, of the coat?
A 115c
B) 85c
C)1.15c
D)0.85c​

Explanation is in the file

cutt.ly/zxt1ipy

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation: