If y is proportional to x and y = -15 when x = -20, what is the value of x when y = 12?

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03-03-2016
Mathematics

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If y is proportional to x and y = -15 when x = -20, what is the value of x when y = 12?

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Аноним Аноним · Answer 1 · 2016-03-03T19:29:41+01:00

Аноним Аноним

03-03-2016

x1= -20
x2= x2
y1= -15
y2= 12

x1 : x2 :: y1 : y2
-20 : x :: -15: 12

Means = x and -15
Extremes= -20 and 12

Product of mean = Product of extremes
-15x = -20*12
x = -240/-15
x2 = 16

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