Find equation in slope-intercept form

1. Sep 8, 2005

gillgill

find equation in slope-intercept form for line through (-2, 3/4) and (2/3, 5/2)
does y=21/32x+33/16 seem right?

find equation in slope-intercept form for line through
Horizontal, through (8,7)
is it y=7??

find equation in slope-intercept form for line with x-intercept -2/3 and perpendicular to 2x-y=4
does y=-1/2x+1/3 right?

Last edited: Sep 8, 2005
2. Sep 9, 2005

andrevdh

You can test your first equation by substituting the points back into your equation.

The second equation y = 7 implies that for all x values the y value are 7. Does this seem right to you?

Your last equation cannot be right since the y-intercept is not the given one!

Last edited: Sep 9, 2005
3. Sep 9, 2005

moose

On this one, I got what you did, except the y-intercept of mine was negative. When I substituted -2/3 for x in y=-1/2x, i got 0=1/3 + b, therefore moving it to the other side would yield a negative....

4. Sep 10, 2005

gillgill

ic...thanks....