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Mathematics 17 Online
OpenStudy (anonymous):

thanks

Directrix (directrix):

The x-intercept is where the graph of the line passes through the x-axis. To get on the x-axis, the y-coordinate must be zero. y = 2x - 5 0 = 2x - 5 Solve for x. @cutegirl

OpenStudy (anonymous):

2.5

OpenStudy (anonymous):

so zero?

Directrix (directrix):

Correct. I think of it as 5/2 but it is 2.5 as well.

Directrix (directrix):

The coordinates of the x-intercept in this problem are this: ( 2.5, 0 )

OpenStudy (anonymous):

so wait its not c?

Directrix (directrix):

Look at the options. Is there a 2.5 or a 5/2 which is the same thing? That is what the x-intercept is.

OpenStudy (anonymous):

yep there is

Directrix (directrix):

Going back to the original equation: y = 2x - 5 and substituting x = 5/2 for x, y = 2*(5/2) - 5 y = 5 - 5 = 0 which tells us that the x-intercept of 5/2 is correct.

OpenStudy (anonymous):

thanks!!

Directrix (directrix):

You are welcome.

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