Find y when x=9 if y varies directly as the square of x, and y=100 when x=5

Question

Landen

Mathematics

9 July, 12:10

Find y when x=9 if y varies directly as the square of x, and y=100 when x=5

+4

Answers (1)

Know the Answer?

Taylor Garner · Answer 1

If y=100 when x=5, then

xz=y (or x times z=y)

so now we know that there is a z, too!

for this problem:

we know that:

x=9

y=? answer: if x=9, then y=180

z=20

20

x 9

___

180

$orry if I confused you!