Let d stand for the cost of a drink and p stand for the cost of a box of popcorn.
d + p = 0.9
2d + p = 1.45
d + p = 0.9
d = 0.9 - p
2(0.9 - p) + p = 1.45
1.8 - 2p + p = 1.45
1.8 - p = 1.45
-p = -0.35
p = 0.35
A box of popcorn costs 35p.
Answer:
y=4x
Step-by-step explanation:
Two variables have a proportional relationship if the ratio of one variable to the other is constant.
A proportional relationship between x and y can be modeled by the equation y=kx.
The letter k is the constant ratio of y to x. It is called the constant of proportionality.
The ratio for each pair of x- and y-values is 4. So, the variables have a proportional relationship.
So, the constant of proportionality is 4 ounces of almonds per ounce of dark chocolate.
The equation for the relationship is:
y=4x
Answer:
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Proportional Relationships
A proportional relationship is one in which two quantities vary directly with each other. We say the variable y varies directly as x if:
y=kx
for some constant k , called the constant of proportionality .
(Some textbooks describe a proportional relationship by saying that " y varies proportionally with x " or that " y is directly proportional to x .")
This means that as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same.
The graph of the proportional relationship equation is a straight line through the origin.
I think it’s b leetttttt ggggggooo
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Answer: 89,58 $ </h3>
Step-by-step explanation:
The formula :
where r is years ; N is the percentage by which we increase the price ; A is the original price
In our case :
Then the monthly salary is equal to:
