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

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 link

Answer 2

Step-by-step explanation:

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