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murphyscott794
19.11.2019 •
Mathematics
Assume r varies jointly with x and y. if r=15 when x=3 and y=4. find r when x=16 and y =1.25
what is r when x=16 and y=1.25
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Ответ:
see explanation
Step-by-step explanation:
given that r varies jointly with x and y then the equation relating them is
r = kxy ← k is the constant of variation
To find k use the condition r = 15 when x = 3 and y = 4
k =
=
= 1.25
r = 1.25xy ← equation of variation
When x = 16 and y = 1.25, then
r = 1.25 × 16 × 1.25 = 25
Ответ: