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SCORPION-xisa [38]
2 years ago
15

Martha compra 2 kilos de tomate y 1 kilo de cebolla pagando S/ 8,40. Si la siguiente semana compra 1 kilo de tomate y 2 kilos de

cebolla pagando S/ 7,80, ¿a cuánto está el kilo de cebolla?
Mathematics
1 answer:
Rashid [163]2 years ago
8 0

Responder:

2,40

Explicación paso a paso:

Dado que:

Dejar :

Tomate = t

Cebolla = n

(2 kilo de t) + (1 kilo de n) = 8.40

(1 kilo de t) + (2 kilo de n) = 7.80

2t + n = 8,40 - - (1)

t + 2n = 7,80 - - (2)

De (2);

t = 7,80 - 2n

Ponga t = 7.80 - 2n en (1)

2 (7,80 - 2n) + n = 8,40

15,6 - 4n + n = 8,40

15,6 - 3n = 8,40

-3n = 8,40 - 15,6

-3n = - 7,2

n = 2,4

t = 7,80 - 2 (2,40)

t = 7,80 - 4,80

t = 3

Por lo tanto, el costo de 1 kilo de cebolla es 2,40

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A bouquet of lilies and tulips has 20 flowers. Lilies cost 3$ each and tulip cost 2$ each. The bouquet costs $48 how many lilies
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Answer:

8 lilies and 12 tulips flowers

Step-by-step explanation:

Let x be the lilies and y be the tulips flower.

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A bouquet of lilies and tulips has 20 flowers, so sum of the lilies and tulip flower is equal to 20 flower,

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Since lilies cost $3 each, tulip cost $2 each and bouquet cost is equal to $48, so we write the equation as.

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From equation 1.

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Substitute x=20-y in equation 2 and simplify.

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Slope-intercept form (y = mx + a):

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To find a, plug in one of the points into the equation:

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a = -3

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