anonymous
  • anonymous
still need some help with point slope formula...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
????
anonymous
  • anonymous
i don't understand how to equate the formula. so if i have (2,3) and (4,5) as points, I can find the slope, but then finding the y intercept by using the point slope is what confuses me Is there another way to find the y intercept?
anonymous
  • anonymous
point-slope form is just one way to write the equation of a line if you know that line goes through a specific point and its slope. the form looks like this: y - y1 = m(x - x1) slope-intercept, which is what you're probably referring to is just a specific case of point-slope form. It's just another way to write the equation of a line. Having it written in this form makes it easy to identify the y-intercept. the form looks like this: y = mx + b. there are many other ways to write the equation of a line, and each has its merits....

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Callisto
  • Callisto
Try this: y-y1 y2 -y1 ---- = ------ x-x1 x2 - x1 y2 -y1 Actually, ------ is the slope, which is m :S x2 - x1
anonymous
  • anonymous
i can get the slope, but how do i get the y intercept, with the 2 points?
anonymous
  • anonymous
do you want an example?
anonymous
  • anonymous
wait... why do you need the y-intercept? is it for graphing?
Callisto
  • Callisto
y-y1 y2 -y1 ---- = ------ x-x1 x2 - x1 y-y1 = m(x-x1) y = mx -mx1 +y1 y = mx +(-mx1 +y1) (-mx1 +y1) is the y-int :D
anonymous
  • anonymous
because, if you already have the equation of a line, all you really need to do is set x=0 and solve for y... no matter what the equation of the line is in....
anonymous
  • anonymous
i guess i need to find the slope and then put it in slope intercept form
anonymous
  • anonymous
so you already have an equation?
anonymous
  • anonymous
-3=-2/3(2)+b
anonymous
  • anonymous
-2/3 being the slope.
anonymous
  • anonymous
I assume (2, -3) is the point you know the line goes through?
anonymous
  • anonymous
yes, that is one point.. the other is (-4,1)
anonymous
  • anonymous
then there's nothing wrong with -3=-2/3(2)+b. Is solving this equation a problem?
anonymous
  • anonymous
seems to be, since i am not getting the correct y intercept. i am getting -1.67
anonymous
  • anonymous
b = -5/3...
anonymous
  • anonymous
is that it?
anonymous
  • anonymous
yes, i cannot seem to get that answer.
anonymous
  • anonymous
-5/3 = -1.66667 (approx)
anonymous
  • anonymous
i seem to be challenged with the signs
anonymous
  • anonymous
what signs?
anonymous
  • anonymous
ok, never mind. i did get the correct answer, just not in fraction form. i wish i had my old scientific calculator that gave answers in fractional form! thanks for your help:)
anonymous
  • anonymous
np... way to stick with it... little bit of advice... get to know fractions... do not avoid them....

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