If x varies directly as y, and x = 10 when y = 5, find x when y = 9. x = ______

Question

asked Jul 5, 2023 44.3k views

1 Answer

Paleta · Answer 1 · 2023-07-11T19:51:25+0000

Solution:

Since x varies directly as y, consider the following diagram:

by cross-multiplication, we get:

$5x\text{ = (9)(10)}$

this is equivalent to:

$5x\text{ = 90}$

solving for x, we get:

$x\text{ = }(90)/(5)=18$

so that, we can conclude that the correct answer is:

x = 18.