You and your friends are going to McDonald's for burgers and fries, and you need to decide between two deals that are being offered. The first deal is getting 4 burgers at b dollars each and 3 fries at f dollars each, which will cost you $26. The other deal is getting 2 burgers at b dollars each and 5 fries at f dollars each, which will cost you $20. What is the cost of each burger and each fries?

the first deal

Step-by-step explanation:

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: