Which systems of equations is in standard form? 4x+3y=16 4 x + 3 y = 16 2x-3y=8 2 x − 3 y = 8 -2y=2-4x − 2 y = 2 − 4 x 3x+2y=12 3 x + 2 y = 12 2x-3y-4=0 2 x − 3 y − 4 = 0 -4x+5y=8

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what level of math? also i don't need to be paid if i can you.

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.

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