3 years ago

If y varies jointly with x and z and y=90 when x=2 and z=9, find x when y=105 and z=3

Mathematics

1 answer:

Inessa05 [86]3 years ago

3 0

Answer:

Step-by-step explanation:

y & xz

y = kxz

k = y/xz

When y = 90, x = 2 and z = 9

k = 90/(2×9) = 10/2

k = 5

y = 5xz

When y = 105 and z = 3

105 = 5×3x

105 = 15x

x = 105/15

x = 7

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