Question

If y is in direct variation with x and x=18 when y=15,then find the value of y when x =4.5

Answer 1

Answer: YOUR ANSWER

Step-by-step explanation: Explanation:

the initial statement is

y

∝

1

x

to convert to an equation multiply by k the constant

of variation

⇒

y

=

k

×

1

x

=

k

x

to find k use the given condition

y

=

15

when

x

=

5

y

=

k

x

⇒

k

=

y

x

=

15

×

5

=

75

equation is

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

∣

∣

∣

2

2

y

=

75

x

2

2

∣

∣

∣

−−−−−−−−−−−−

when

x

=

25

then

y

=

75

25

=

3

Answer 2

Answer:

3.75

Step-by-step explanation:

x = 18 and y = 15

x / y = z

18 / 15 = 1.2

if x = 4.5

x / y = z

4.5 / y = 1.2

4.5 = 1.2 * y

y = 4.5 / 1.2

= 3.75