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3 years ago

15

Variable y varies directly with x2, and y = 196 when x = 7.

1 answer:

Alenkinab [10]3 years ago

7 0

$y=kx^2$
k - a constant

$y=196 \ when \ x=7 \\
196=k \times 7^2 \\
196=49k \\
\frac{196}{49}=k \\
k=4 \\ \\
\boxed{y=4x^2}$

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