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nekit [7.7K]
3 years ago
10

X varies directly with y. if y = -57 when x = 9, find x when y = 27.

Mathematics
1 answer:
kifflom [539]3 years ago
7 0

Answer:

x = -81 / 19

Step-by-step explanation:

y = kx

-57 = 9k

k = -57/9 or -19/3

27 = \frac{-19x}{3}

-19x = 81

x = -81 / 19

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Answer:If she buys 60 tiles, the cost at both shops is the same.

If she buys less than 60 tiles, then the second shop is cheaper.

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Step-by-step explanation:

Explanation:

Let the number of tiles be

x

At the first shop: Cost =

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×

x

+

$

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=

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x

+

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=

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+

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←

solve for x

1.19

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0.4

x

=

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x

=

24

0.4

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=

60

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If she buys less than 60 tiles, then the second shop is cheaper.

If she buys more than 60 tiles, then the first shop is cheaper.

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