HELP number 12 pls i do nor have long more

Dian has $250 originally.

Step-by-step explanation:

Let the total money Dian has originally = $S

Dian gave of her total money to Justin,

Money given to Justin =

Money left with Dian = S -

                                   =

                                   =

Since Dian has $150 left then the equation will be,

S =

S = $250

Therefore, Dian has $250 originally.

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: