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sineoko [7]
3 years ago
9

HELP! Please coins and a Brainly :)

Mathematics
1 answer:
blsea [12.9K]3 years ago
6 0

Since it's a linear equation and there's a constant rate (given in the problem), we can choose our x - axis to be the time and the y - axis to be height. We choose it that way because you are going up in the elevator. The more time in the elevator, the higher you go.


Finding this equation uses the point slope formula, y - y₁ = m(x - x₁). It can be done with slope-intercept, y = mx + b too.).


First we need to get the slope of the line. Choose any two points, but be consistent and choose two y points as well as the matching x ones. Here, we use x₁ = 2, x₂ = 4, y₁ = 45, y₂ = 75. Slope, m, is y₂ - y₁ / x₂ - x₁.


m = 75 - 45 / 4 - 2

= 30 /2

= 15


Next, we use the slope of 15 and either of the points to find the linear equation. Choose the same (2, 45) x-y pair above, but any point will work.


y - 45 = 15 (x - 2)

y - 45 = 15x - 30

y = 15x + 15


So the linear equation representing this table us y = 15x + 15.

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I believe it's 3 because 4 times 3 equals 12 and 12 plus 8 equals 20! 
4(3)+8=20

Hoped this helped! :)
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slavikrds [6]

Answer:

Plates are 2.80 Dollars and cups are 1.40 dollars

Step-by-step explanation:

Cups = c

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6p + 5c = 23.80 ==> multiply by 6 ==> 36p + 30c = 142.80

7p + 6c = 28.00 ==> multiply by 5 ==> 35p + 30c = 140.00

Now use algebra to have the 30c be on one side and the rest on the other:

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30c = 142.80 - 36p

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Now set them equal to each other about the 30c:

142.80 - 36p = 140.00 - 35p

Use algebra to solve for p:

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142.80 = 140.00 + p | - 140

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Go back to one of the "30c" equations and plug in the value for p:

30c = 140 - 35p

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c = 1.4

8 0
3 years ago
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The sum of the number times 3 and 15​
Anon25 [30]

Answer:

45 should be the answer

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3 years ago
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Twice the sum of a number and negative two is sixteen. find the number
dexar [7]
It would be 9 because 2x9=18. Then 18+-2=16.
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Answer:

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24 x 1.06 = 24.44 (6% tax added to 24)

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