Question

If x varies directly as y and x-0.75 when y-5, find x when y=21.​

Answer 1

Qᴜᴇsᴛɪᴏɴ :-

if x varies directly as y and x = 0.75 when y = 5. find x when y = 21 ?

Sᴏʟᴜᴛɪᴏɴ :-

Varies Directly :- Also Known as Directly proportional , that Means, as one amount increases, another amount also increases at the same rate.

→ x ∝ y

→ x = ky ( where k is any constant Number ).

So,

→ 0.75 = k * 5

→ k = 0.75/5

→ k = 0.15 .

Therefore , when y = 21 .

→ x = k * y

→ x = (0.15) * 21

→ x = 3.15 (Ans.)

Hence, value of x will be 3.15 when y is 21.

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Answer 2

Answer:

I really don't know the answer