A toll bridge charges $4 for a car and $6 for a truck. One day 200 of the vehicles crossed the bridge and paid a total of $860 in tolls. How many
of these vehicles were trucks?

correct answer:

b.(19,-2)

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:

m∠a is 90°

m∠b is 40°

explanation:

step-by-step explanation: