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Suppose s and t are directly proportional. If s=14 when t=18, what is s  when t=7?

 Jan 23, 2021
 #1
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18/14 equals 7/x.

Cross multiplying we get 91=18x

x=91/18

 Jan 23, 2021
 #2
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MooMoo, 7 • 14 = 98.   Not 91.  

.

Guest Jan 23, 2021
 #3
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Thanks for pointing that out guest...

98/18 or 49/9

MooMooooMooM  Jan 23, 2021
 #4
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Suppose s and t are directly proportional. If s=14 when t=18, what is s  when t=7?

 

14 / 18 = s / 7      s = (14 * 7) / 18

 Jan 23, 2021
 #5
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s = kt    k = proportionality konstant

14 = k(18)

k = 14/18 = 7/9

 

sooo    s = 7/9 t

            s = 7/9 (7)

               = 49/9

 Jan 23, 2021

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