Question

If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11?

y (11)

y (11)

y- (1939

11

y11/(18)(5)

Answer 1

Answer: The value of y is 39.6 when x = 11 and the required expression is y(11) = 39.6

Explanation:

Since we have given that

y varies directly as x.

If y = 18, when x = 5.

So, we need to find the value of y when x is 11.

According to question, we get that

`(y)/(x)=(18)/(5)=(y)/(11)\\\\18* 11=5y\\\\198=5y\\\\(198)/(5)=y\\\\y=39.6`

Hence, the value of y is 39.6 when x = 11 and the required expression is y(11) = 39.6