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shaylawaldo11
05.01.2021 •
Mathematics
Y = X - ( 20x). What is the sale price if the cereal cost $4.00?
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Ответ:
Question:
The grocery store has 20% off from the original price on cereal. The equation for finding the sale price would be y = x - (.20x). What is the sale price if the cereal cost $4.00?
The sales price is $3.20
Step-by-step explanation:
Given
Required
Determine y when x = 4.00
To do this, we simply substitute 4.00 for x in![y = x - (0.20x)](/tpl/images/1013/6653/869a8.png)
Hence, the sales price is $3.20
Ответ:
First a more theoretical approach.
Suppose that we have a point (x, y), if you want to do a reflection over the y-axis, this point will transform into (-x, y).
This reflection leaves unchanged the distance between the point and the closest point to the axis of reflection.
Below, you can see a rough sketch of the situation.
Where the distance between the point S and the axis of reflection is 2 units, and the same for the distance between S' and the axis of reflection.
"Do you think you would see the same characteristic if you drew the line segment connecting T with the reflecting line and then T' with the reflecting line? How do you know?"
Yes, because as i wrote above, the distance between the point and the axis of reflection is invariant in this type of transformations.