Problem:
Let be the image when the line is reflected across the -axis. The value of is
Answer Choices:
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Solution:
The equation of the given line can be written as . The intercept, , of the image is and the slope, , is . Thus .
If the point is on the reflection of the given line, then the point is on the given line. Hence , so is an equation for the reflected line. The equation of this line can be written , so .