y varies directly as $x^2$. When $x=3$, $y=45$. Find the formula connecting $y$ an

Question

y varies directly as $x^2$. When $x=3$, $y=45$. Find the formula connecting $y$ and $x$; [2] $y$ when $x=-4$; [1] the positive value of $x$ when $y=80$. [1]

Accepted Answer

(a) $y=5x^2$; (b) $y=80$; (c) $x=4$.

Functions and Graphs

Functions and Graphs

Solution:

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