$$y \text { varies directly as } z \text { and } y = 306 \text { when } z = 18 \text {. Find } y \text { when } z \text { is } 19 \text {. }$$
A) 323
B) 289
C) 361
D) 324

Question

Quizplus · Accepted Answer

Since $y$ varies directly as $z$, we can write $y = kz$, where $k$ is the constant of variation. Given $y = 306$ when $z = 18$, we find $k = \frac{306}{18} = 17$. To find $y$ when $z = 19$, we substitute $z = 19$ into $y = kz$ to get $y = 17 \times 19 = 323$.

y varies directly as z and y=306 when z=18. Find y when z is 19. y \text { varies directly as } z \text { and } y = 306 \text { when } z = 18 \text {. Find } y \text { when } z \text { is } 19 \text {. }y varies directly as z and y=306 when z=18. Find y when z is 19.

$y \text { varies directly as } z \text { and } y = 306 \text { when } z = 18 \text {. Find } y \text { when } z \text { is } 19 \text {. }$