Posted by **trixie** on Thursday, September 3, 2009 at 6:32pm.

it says write the equation of the vertical line that passes through the point (7,-3). what do i need to start it off?

find the equation for the line with undefined slope and passing through the point (-1,-2). what do i need to start that off?

what equation do i use to find the slope-intercept?

whats the point-slope form?

- algebra review! -
**Reiny**, Thursday, September 3, 2009 at 8:38pm
any vertical line has an undefined slope and always has the form x = c, where c is a constant.

All you need is a point, then simply state it as x = 'the x of the given point'

so for your first one : x = 7

for the second x = -1

slope-intercept form looks like this

y = mx + b, where m is the slope and b is the y-intercept

e.g. y = 4x + 9

the slope is 4 and the y-intercept is 9

the point-slope form is one of the best ways to find the equation of a straight line, given the slope and a point

e.g. given the point (5,-3) and slope of 2/3, find the equation

y - (-3) = (2/3)(x - 5)

3(y+3) = 2(x-5)

3y + 3 = 2x - 10

you can now re-arrange it to end up with any version they ask for.

- algebra review! -
**Reiny**, Thursday, September 3, 2009 at 8:43pm
my last line should have been

3y + 9 = 2x - 10

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