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Anvisha [2.4K]
2 years ago
15

X is partly constant, and partly varies as y. When y= 2 , x = 30 and when y = 6, x = 50

Mathematics
2 answers:
kirza4 [7]2 years ago
7 0

"X is partly constant and partly varies as y"

---> x = ky + p

when y=2,x=30 ---> 30 = 2k + p

when y=6,x=50 ---> 50 = 6k + p

subtract: 20 = 4k

k = 5

sub back in the first: 30 = 10+p

p = 20

x = 5y + 20

now you can answer B

notice this is just a variation of y = mx + b

MrRissso [65]2 years ago
3 0

"X is partly constant and partly varies as y"

---> x = ky + p

when y=2,x=30 ---> 30 = 2k + p

when y=6,x=50 ---> 50 = 6k + p

subtract: 20 = 4k

k = 5

sub back in the first: 30 = 10+p

p = 20

x = 5y + 20

now you can answer B

notice this is just a variation of y = mx + b

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sdas [7]

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26.4 km/hr

Step-by-step explanation:

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For Sofia

We convert miles to km

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x = 115.2 km

We find the speed in km/hr

Speed = Distance /Time

= 115.2km/1.5 hours

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Diego drives 126 km in 2 hour 30 min.

Speed = Distance/Time

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The difference between their average speeds in km/h is calculated as:

76.8 km/hr - 50.4 km/hr

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2 years ago
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3 years ago
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