Question

If y varies directly as x, and y is 400 when x is r and y is r when x is 4, what is the numeric constant of variation in this relation?

Answer 1

It is not 100

Explanation:

Answer 2

so than y varies directly with x this mean y = x
so than y=400 when x=r andy = r when x = 4

y=400 ------ x=r
y =r ------ x=4

bc. we know that y varies directly as x so y=nx so r= 4/400 = 1/100

the numeric constant is r = 1/100