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VladimirAG [237]
3 years ago
15

Finding the original price with 80% and the sale price of $90

Mathematics
2 answers:
PtichkaEL [24]3 years ago
5 0
90/x = 80/100

90*100 = 9000

9000/80 = 112.5

112.50$
babymother [125]3 years ago
3 0
The original price is $112.50.
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The values of x and y are proportional. Determine the constant of proportionality(k)
Studentka2010 [4]
<h3>The constant of proportionality is k = 5</h3>

For direct proportion equations, you divide the y value over its corresponding x value to get the value of k.

For example, the point (x,y) = (2,10) is on the diagonal line. So k = y/x = 10/2 = 5.

Another example: the point (x,y) = (6, 30) is also on the same diagonal line, so k = y/x = 30/6 = 5 is the same result as before.

You can use any point on the diagonal line as long as it is not (0,0). This is because division by zero is not allowed.

side note: the direct proportion equation y = k*x becomes y = 5*x which is the graph of that diagonal line. The slope is m = 5, the y intercept is b = 0. All direct proportion graphs go through the origin as shown in the diagram.

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3 years ago
You.have at most $8 to buy lunch. Sandwiches cost $4 each, drinks cost $1.50 each, and cookies cost $0.75 each. If you buy a san
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5 0
3 years ago
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Now we have 1 / (1/25). 

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The answer is 25!

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