SOLUTION: Determine which equation represents y as a function of x. a. y = −3x − 5 b. y ^(2) = −3x c. ( y + 4)^(2) + (x − 3)^(2) = 18

Algebra ->  Functions -> SOLUTION: Determine which equation represents y as a function of x. a. y = −3x − 5 b. y ^(2) = −3x c. ( y + 4)^(2) + (x − 3)^(2) = 18       Log On


   

Question 484911: Determine which equation represents y as a function of x.

a. y = −3x − 5
b. y ^(2) = −3x
c. ( y + 4)^(2) + (x − 3)^(2) = 18
d. x = y ^(2) + 5y
e. None of the above

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
a function associates a single output to each input; in other words, for any value of x you plug in to the first equation, you can find a single value for y
son your answer is a. y = −3x − 5
However, in the second, third, and fourth equation , for every value of x that you plug in there are two possible values of y that will work.

y%5E2+=+-3x
y%5E2+=-3%28-3%29=9
y+=sqrt%289%29

y+=+-3
so, if x is -3, y can be either 3 or -3