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Mathematics 19 Online
OpenStudy (anonymous):

RECEIVE FAN AND MEDAL Select the equation of the line that passes through the point (3, 5) and is perpendicular to the line x = 4.

OpenStudy (anonymous):

@pandaecat

OpenStudy (pandaecat):

Is this mutiple choice?

OpenStudy (anonymous):

y = 5 x = 5 y = 4 x = 3

OpenStudy (pandaecat):

Let's see... well perpendicular lines have opposite reciprocal slopes, so what do u think?

OpenStudy (anonymous):

Well I don't really understand this concept

OpenStudy (pandaecat):

The other line would be 90 degrees from x=4, which I suppose would be y=4

OpenStudy (anonymous):

So C? @pandaecat

OpenStudy (pandaecat):

Yes I believe so

OpenStudy (anonymous):

Thx

OpenStudy (anonymous):

Can u help me with another one? @pandaecat

OpenStudy (anonymous):

Which of the following lines is parallel to x = 8? 3y = 16 x = 7 x = y y = 8

OpenStudy (anonymous):

@marihelenh

OpenStudy (anonymous):

@ospreytriple

OpenStudy (saiyan):

hit me up with a medal

OpenStudy (anonymous):

ANYONE

OpenStudy (anonymous):

@Saiyan already gave it to @pandaecat

OpenStudy (saiyan):

it is the second one

OpenStudy (saiyan):

ok

OpenStudy (marihelenh):

If it is perpendicular, the lines will only intersect once. The question gives you the point (3,5). If you are finding a line perpendicular to x=4, it will always be y=something. You are given the point (3,5), and they y of the ordered pair is equal to 5, so the line you are looking for is y=5.

OpenStudy (marihelenh):

I am positive that it is y=5, not y=4.

OpenStudy (anonymous):

The answer you chose to the first question is incorrect. The line y=4 does not pass through the point (3, 5).

OpenStudy (anonymous):

For the second question, the graph of x=8 is a vertical line that intercepts the x-axis at 8. A line that is parallel to this must therefore also be a vertical line. Vertical lines have equations like x=(x-intercept). Is there a choice that fits this description?

OpenStudy (marihelenh):

Because it is parallel, like @ospreytriple said, the other line must be vertical too. Only one of the options you are given would give you a vertical line. Your answer must be equal to x so the slopes are similar.

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