anonymous
  • anonymous
quick question.... On a xy-coordinate how do i know what to plug in the y2-y1/x2-x1 formula
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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idku
  • idku
u should know the 2 points through which your line is going or one x or y coordinate can be not given, but then you have to know the slope to solve for this coordinate
anonymous
  • anonymous
if the y-intercept is 12 and the x-intercept is 5 ... how do i know which one to plug in where?
Nnesha
  • Nnesha
y = mx + b where m is slope and b is y-intercept x-intercept is when y =0 so you can write it in parentheses (x,y)----->>(5,0)

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anonymous
  • anonymous
no but in the y2-y1/x2/x1
Nnesha
  • Nnesha
ohh so if y-intercept is 12 remember y-intercept when line cross y-axis when x=0 so (0 ,12) and x-intercept like i say x when line cross x-axis when y = 0 so (5,0)
anonymous
  • anonymous
yea so how do i know which goes first in the y2-y1/x2-x1
Nnesha
  • Nnesha
|dw:1433802336037:dw| and it doesn't matter just remember y values should be at the top
anonymous
  • anonymous
so it doesn't mater if the 12 is y2 or y1 in the equation? and the same for the 5 ?
Nnesha
  • Nnesha
yes right :-)
anonymous
  • anonymous
oh.... hmmmmm well lemme try my question because i got something different...
anonymous
  • anonymous
wait no it's not it....
anonymous
  • anonymous
i'm supposed to get a -12/5 but if i plug it in anywhere i can also get a positive 12/5
Nnesha
  • Nnesha
or you can see which number is coming first for exxample (5,0)(0,12)|dw:1433802577923:dw| (0,12) is first so y_1 is 12 that's how i do it
anonymous
  • anonymous
so left to right whatever is first? so it would be 12-0/ 0-5?
Nnesha
  • Nnesha
it doesn't matter you will get the same answer :-)
anonymous
  • anonymous
ohhh okay so always right to left?
Nnesha
  • Nnesha
yep that works too
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @yomamabf i'm supposed to get a -12/5 but if i plug it in anywhere i can also get a positive 12/5 \(\color{blue}{\text{End of Quote}}\) (5,0)(0,12) \[\huge\rm \frac{ 12-0 }{ 0-5 }=-\frac{ 12 }{ 5 }\] now other way (0,12)(5,0) \[\frac{ 0-12 }{ 5-0} = \frac{ -12 }{ 5 }\] same ?
anonymous
  • anonymous
oh okay i got it
Nnesha
  • Nnesha
u will get the same answer :-)
anonymous
  • anonymous
also it can be this too right? y=m(5)+12 =-12/5
Nnesha
  • Nnesha
nope x_2 - x_1 = 5 in this case bec x = 0 so that will work but NO!
Nnesha
  • Nnesha
Let x_2 = 3 and x_1 = 1 x_2 - x_1 = 2-1 =1 so you CAN'T substitute 1 for just x
anonymous
  • anonymous
hmmm okay
Nnesha
  • Nnesha
yeah :-)
anonymous
  • anonymous
thank you <333
Nnesha
  • Nnesha
but you can pick any x value from two order pair (5,0)(0,12) to plug in this equation y = mx+b u will get the same answer
Nnesha
  • Nnesha
my pleasure :-) gO_Od luck!

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