Students are working on problems where they convert distances measured in miles to kilometers. To estimate the number of kilometers, Tony takes the number of miles, doubles it, then subtracts 20% of the result. Zia first divides the number of miles by 5, then multiplies the result by 8. Do these two methods give the same results? Explain why or why not.

if you was gonna solve for a, a is a   < -12

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: