2 years ago

3(x+y)=7(y-x), 5(3x-y)=x+3

2 answers:

8 0

3(x+y) = 7(y-x)
3x+3y = 7y-7x
3x+7x +3y -7y = 0
10x - 5y = 0 —> *7
70x-35y = 0

5(3x-y)=x+3
15x-y =x+3
15x-x-y = 3
14x -y = 3 —>*5
70x-5y =15

70x-70x-5y-(-35y) = 15
30y = 15
y = 1/2

-2.5 +10x = 0
10x = 2.5
x = 0.25

hram777 [196]2 years ago

4 0

Answer:

i am not sure thi sis the first one

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3 years ago

The price of a cup coffee was 2.40 yesterday. Today, the price fell to 2.15 find the percentage decrease. Round the answer to th

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ANSWER

The percentage decrease is 10.4%.

EXPLANATION

To calculate percentage decrease, use the formula,

Percentage decrease

$= \frac{new \: price - old \: price}{old \: price} \times 100\%$

Yesterday the price of coffee was 2.40. This is the old price.

Today the price is 2.15. This is the new price.

$= \frac{2.15 - 2.40}{2.40} \times 100\%$

$= \frac{ - 0.25}{2.40} \times 100\%$

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To the nearest tenth, we have:

$- 10.4\%$

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3 years ago

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