Question

y varies directly as the square of x. When x = 5, y = 100. Find y when x = 6

Answer 1

So basically:

\(\Rightarrow y = kx^2\)

Answer 2

You can find k by substitution.

\(\Rightarrow 100 = k \times 25 \)
\(\Rightarrow k = 4\)

Answer 3

I believe Y would = 120..?

Answer 4

Now apply the same formula \(y = kx^2\) when x = 6 and k = 4

\(\Rightarrow y = 4 \times 6^2 \)
\(\Rightarrow y = 4 \times 36\)
\(\Rightarrow y = 144\)

Answer 5

No....

Answer 6

Okay, I understand it.

Answer 7

Excellent!

Answer 8

i believe the answer is y=144
XD..