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irinina [24]
3 years ago
5

Suppose y varies directly with x, and y= 7 when x = 3. What is the value of x when y = 28? If 7 = k(3) then 28 = k(x) Find x

Mathematics
1 answer:
Rama09 [41]3 years ago
7 0
Let y and x be the numbers that  varies directly (that means they keep the same proportion)

Then we have 7y = 3x, OR y/x =7/3 (this ratio should be kept for any value of x and y:
y/x = 7/3, if y = 28, then 28/x = 7/3 or x = (3)(28)/7 = 12

SO X = 12
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Haciendo y el tema de ambas ecuaciones, tenemos;

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Para la ecuación (2), tenemos;

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65/3 - 2/3 · x = 55 - 4 · x

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