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Mathematics 17 Online
OpenStudy (anonymous):

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Directrix (directrix):

3x +2y =4----multiply by 2 -- 6x +4y = 8 -6x -4y = -8 ---------------- 6x -4y =-8 If you multiply the first equation by 2, you notice that if you add the two equations, the result will be 0 + 0 = 0 There is not one solution. That option can be eliminated. Let's look at the graphs.

OpenStudy (anonymous):

ok

Directrix (directrix):

Note that the two lines are the same. They coincide at every point with infinitely many solutions because there are infinitely many points on a line.

Directrix (directrix):

So, what do you think the answer will be?

OpenStudy (anonymous):

A i believe

Directrix (directrix):

Correct.

Directrix (directrix):

On #2, start at the origin. That is where the x and y axes meet. Go one unit to the right to get underneath the point. That will be an x of 1. Then move upward from that 1 two units to get to the point.

Directrix (directrix):

What do you think the coordinates of that point will be? We already know that x = 1 but we need the y. (1, ?)

OpenStudy (anonymous):

1,2?

Directrix (directrix):

(1,2) B Correct.

OpenStudy (anonymous):

ty

Directrix (directrix):

You are welcome.

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