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Anika [276]
3 years ago
7

This is all I know what to do any help?

Mathematics
1 answer:
svetoff [14.1K]3 years ago
4 0
You can multiply the second equation by -2 

-5x + y = 15         everything by -2

10x - 2y = -30

now you can solve them

2x + 2y = -6
10x - 2y = -30

y cancels

2x= -6
10x = -30


12x = -36
/12.     /12

x = -3 


now to solve for y you substitute x for -3

-5(-3) + y = 15
15 + y = 15 
-15        -15

       y= 0
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Answer:

20 miles per hour

Step-by-step explanation:

traveling against the wind was 160mph (400/2.5)

traveling with the wind was 200mph (400/2)

going against the wind is going in the negative direction of the wind speed, and going with the wind is going in a positive direction of the wind speed, therefore the wind speed is |direction1-direction2|/2, which would be |200-160|/2 = |40|/2 = 20mph

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Find the area of a circle whose area equals the half of the sum of the areas of two circles with radil 2 and 3.
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step 2. if r = 3 then its area = (pi)r^2 = (pi)(9) = 9pi

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3 years ago
A gallon of milks sells for $3.18 and a quart of milk sells for $0.76. Which item has the better unit price? Justify your answer
nataly862011 [7]

Answer:

Second\ price\ that\ is\ 1\ quart\ milk=\$0.76\ has\ better\ unit\ price

Step-by-step explanation:

Use gallon unit:

<u><em>First Price:</em></u>

1\ gallon\ milk=\$3.18\\\\

<em><u>Second Price:</u></em>

<em><u /></em>4\ quart=1\ gallon\\\\1\ quart\milk=\$0.76\\\\4\ quart\ milk=4\times 0.76=\$3.04\\\\\Rightarrow 1\ gallon\ milk=\$3.04<em><u /></em>

<em><u /></em>

<em><u /></em>1\ gallon\ at\ first\ price\ is\ greater\ than\ the\ rate\ of\ 1\ gallon\ at\ second\ price\\\\Hence\ 1\ quart=\$0.76\ has\ the\ better\ unit\ price.<em><u /></em>

<em><u /></em>

Second Method: Use Quart Unit:

<u><em>First Price:</em></u>

1\ gallon=4\ quart\\\\1\ gallon\ milk=\$3.18\\\\4\ quart\ milk=\$3.18\\\\1\ quart\ milk=\frac{3.18}{4}=\$0.795

<u><em>Second Price:</em></u>

<u><em /></u>1\ quart\ milk=\$0.76<u><em /></u>

<u><em /></u>

<u><em /></u>Second\ price\ that\ is\ 1\ quart\ milk=\$0.76\ has\ better\ unit\ price<u><em /></u>

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