Question

Variable y varies directly with x2, and y = 32 when x = 4.
Which graph represents the quadratic variation?

A. http://static.k12.com/calms_media/media/1540000_1540500/1540310/1/e704306724d0e3058f5f975d02ad64262eb5d886/MS_ALG_S2_01_12_quiz_Q5a_question.gif
B. http://static.k12.com/calms_media/media/1540000_1540500/1540311/1/d3c9c95d917ce7280f5dbce58d52cc1b289e4903/MS_ALG_S2_01_12_quiz_Q5b_question.gif
C. http://static.k12.com/calms_media/media/1540000_1540500/1540312/1/520c64d5cf628a3b4b22b816792234a7675902b7/MS_ALG_S2_01_12_quiz_Q5c_question.gif

Answer 1

D http://static.k12.com/calms_media/media/1540000_1540500/1540313/1/69f31c1a860fc344187f2804ec831319d4f09b69/MS_ALG_S2_01_12_quiz_Q5d_question.gif

Answer 2

@Nnesha @ybarrap

Answer 3

do u guys understand it. i dont

Answer 4

@kittenlover731

Answer 5

Sorry but I don't know this kind of stuff:/

Answer 6

thx anyway

Answer 7

y varies directly with something means some constant times that other variable:
$$
y=\alpha x^2\\
32=\alpha 4^2\\
\alpha={32\over 4^2}\\
\implies y=2x^2
$$
Which of your graphs match this equation? Just plug in some values.

Answer 8

ok thx.

Answer 9

Does this make sense?

Answer 10

yes.

Answer 11

cool - take care