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September 21, 2014

September 21, 2014

Posted by **anonymous** on Saturday, December 8, 2007 at 10:18pm.

Write the equation of the line passing through each of the given pairs of points. Write the answer in slope-intercept form, where possible. (-1,3) and (4,-2)

- algebra -
**drwls**, Sunday, December 9, 2007 at 12:53amYou have asked two separate questions.

In the first problem, get the slope of the line between those points. It is

m = (y2-y1)/(x2-x1)

=(-4 -5)/(-3-0) = -9/-3 = 3

The slope of a line perpendicular to that has to be -1/3, because the product of the two slopes must be -1.

In the second problem, first get the slope

m = (-2 -3)/[4-(-1)] = -1

So y = -x + b

Solve for b by requiring

3 = -(-1) + b

b = 2

y = -x +2

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