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Mathematics 25 Online
OpenStudy (anonymous):

@mathstudent55

OpenStudy (anonymous):

OpenStudy (mathstudent55):

Take the equation of the second graph, and add 3 to both sides. What do you get?

OpenStudy (anonymous):

to the right 3 @mathstudent55

OpenStudy (mathstudent55):

This is the equation of the second graph. y = -2|x| - 3 Can you add 3 to both sides and show what you get?

OpenStudy (anonymous):

y+3 = -2|x|

OpenStudy (mathstudent55):

Great. That is correct. You see, you do deserve a medal. Now notice that the second equation is just like the first equation, but with one difference. First equation: y = -2|x| Second equation: y + 3 = -2|x| The difference is that in the second equation, you have y + 3 instead of y, right?

OpenStudy (anonymous):

yes..

OpenStudy (mathstudent55):

Good. Now remember what we did in an earlier problem with a vertical translation. When y is replaced by y - k, the graph is translated k units vertically. If k is positive, the translation is up. If k is negative, the translation is down.

OpenStudy (mathstudent55):

We have y replaced by y + 3. We need to write it as y - k, y minus a number. y + 3 = y - (-3) That means k is -3, a negative number.

OpenStudy (anonymous):

y-k y-3

OpenStudy (anonymous):

two neg. make a positive y+3

OpenStudy (mathstudent55):

Yes to your very last answer. No to your previous answer. Look what I wrote just above your next to last answer. If you have y + 3, you can't just call it y - 3. They are different. What you do is you call it y - (-3) since two negatives make a positive. y + 3 = y - (-3). Now you have it in the form of y minus a number. The number happens to be -3, a negative number. That means a translation of 3 units down.

OpenStudy (mathstudent55):

Now you can answer the question.

OpenStudy (anonymous):

thanks.. I have like 6 more just like this >.<

OpenStudy (mathstudent55):

I have to go.

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