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13.06.2020 •
Mathematics
Line y = -2x - 1 is transformed by dilation with a scale factor of 2 and centered at (1,-3). Write the equation of lines image
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Ответ:
The y value is equivalent to the centre of dilation, the equation of the line image will be equal to y = -2x - 1
The standard form of an equation is expressed as y = mx + b
m is the slope of the line
b is the y-intercept
Given the equation of a line expressed as y = -2x - 1
If the line is transformed by dilation with a scale factor of 2 and centred at (1, -3)
First, we will need to find the y-value for which x = 1
y = -2(1) - 1
y = -2 - 1
y = -3
Since the y value is equivalent to the centre of dilation, the equation of the line image will be equal to y = -2x - 1
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Ответ:
Step-by-step explanation:
The given equation of line is
The above line dilated with a scale factor of 2 and centered at (1,-3).
Substitute
in the given equation.
The line passing through (1,-3). It means, the given line passing through the center of dilation.
We know that if a line passes through the center of the dilation, then nothing will change and equation of image is same as the equation of line.
So, the equation of image of line is
.
Ответ:
The number of revolutions per minute that are made by the tire is 110
Step-by-step explanation:
step 1
Find the circumference of the tire
The circumference of a circle is
we have
1 ft=12 in
Convert in to ft
substitute
Remember that one revolution represent the length of the circumference
so
using proportion
Find out how many revolutions are made by the tire in one minute
Let
x -----> the number of revolutions in one minute
therefore
The number of revolutions per minute that are made by the tire is 110