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Mnenie [13.5K]
3 years ago
14

Suppose y varies directly as x and y equals 21 when x = 3 find x when y = 42

Mathematics
2 answers:
natali 33 [55]3 years ago
8 0
Y α x

y = cx          where c = constant of proportionality 

cx = y

c = y/x

y = 21, x = 3,          y = 42,  x = ?

y/x = c

21/3 = 42/x

7 = 42/x

x = 42/7

x = 6

so x = 6

Hope this explains it.
pentagon [3]3 years ago
7 0
<span>y = kx find k

21 = k*3
k = 7

Equation:
y = 7x
Find x when y = 42
42 = 7x
x = 42/7
x = 6

answer: </span><span>x = 6  when y = 42</span>
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