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ACT Aspire Math: Identifying the Graph of a Reflected Line 6 Views
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Description:
The graph of y = -x + 5 is reflected across the x-axis.
Which of the following shows the reflected graph?
Transcript
- 00:03
Okay Shmoop math people Here we go A graft coming
- 00:06
at you The graph of y equals negative X plus
- 00:08
five is reflected across the x axis Which of the
- 00:12
following shows the reflected graph Okay do we need to
- 00:19
get out our handy dandy pocket mirror for this problem
Full Transcript
- 00:22
We advise against it since to see the reflection from
- 00:24
the right angle you'd probably have to smash your face
- 00:27
up against your desk Instead let's consider what rules we
- 00:30
know about transform ations But when we reflect a point
- 00:32
across the x axis we multiply the original y coordinate
- 00:36
by negative one Find a new why co ordinate while
- 00:38
the x coordinate remains unchanged In other words the rule
- 00:41
to remember about reflecting across the x axis is that
- 00:45
the point x why would be transformed into the point
- 00:48
x negative y very important concept here were given a
- 00:52
line and an equation for that line No why calls
- 00:54
they could expose five rather than a set of points
- 00:57
However we can imagine that line is having many different
- 01:00
points on it in reflecting those many different points across
- 01:03
the x axis We know that for each point will
- 01:06
retain the same x values but corresponding why values should
- 01:10
be multiplied by negative one Right So our new equation
- 01:13
then will demonstrate those new negative y values right there
- 01:16
multiplied by negative one So we get negative y equals
- 01:19
negative x plus five Well to graft this equation no
- 01:22
we just put it into slope intercept form y equals
- 01:24
mx plus b That means we'll need to multiply both
- 01:27
sides by negative one so we can isolate that Why
- 01:29
there And we get y equals negative The quantity there
- 01:32
of negative exposed five or y equals x minus five
- 01:36
So the reflected graph corresponds to the equation Y equals 00:01:40.281 --> [endTime] x minus five and that's pretty much it
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