Which pair of equations are perpendicular lines? a. 5x + 2y = 9 and y = –5/2x+27/2 b. x – 3y = 11 and y = –3x + 23 c. 4x + 2y = 6 and y = –2x + 18 d. x – 3y = 5 and y = 3x – 1

ok

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: