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Mathematics 44 Online
OpenStudy (anonymous):

Find y-intercepts of 45x^2 + 25y^2 = 16

OpenStudy (amistre64):

what defines a y-intercept?

OpenStudy (amistre64):

or rather, what value of x defines a y intercept?

OpenStudy (anonymous):

when linejoining on the y axis, right?

OpenStudy (amistre64):

good, the joining of line and y axis is a suitable definition

OpenStudy (amistre64):

what value is x at the y-axis tho?

OpenStudy (anonymous):

25

OpenStudy (amistre64):

no, x does not equal 25 at the y-axis if we take a sample of point off of the y-axis, they read: (0,1) (0,3) (0,-7.8) (0,n)

OpenStudy (anonymous):

How do we take sample of points?

OpenStudy (amistre64):

well, instead of taking all of the points that form the y-axis; we simply pick out a few of them to compare.

OpenStudy (amistre64):

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