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[Vittorio 34]

Find the rise in moving from point P 1(2,-4) to p 2 (7,8)

 

[skeeter]

Find the rise in moving from point P 1(2,-4) to p 2 (7,8)

grid plot attached ..

 

[eddy2017]

grid plot attached ..

View attachment 28044

skeeter if i want to know how much the rise is ?. how do i go about it?

 

[skeeter]

skeeter if i want to know how much the rise is ?. how do i go about it?

rise = [MATH]|\Delta y|[/MATH]

 

[eddy2017]

rise = [MATH]|\Delta y|[/MATH]

by plotting the two points and the counting how much we rise and run, right?>

 

[Deleted member 4993]

If you want to calculate the rise and run from P₁ (x₁,y₁) to P₂ (x₂,y₂) then:

rise (from P₁ to P₂) = \(\displaystyle \Delta y\) = y₂ - y₁ .................. and

run (from P₁ to P₂) = \(\displaystyle \Delta x\) = x₂ - x₁

 

[eddy2017]

like that i plotted the two points (2,-4) to p 2 (7,8)
and the i counted how far up i went and how far along and the rise=11 and the run =7
so the slope is 11/7
but the question is find the rise
the rise is the change in y so
change in y=11
is this okay

 

[eddy2017]

If you want to calculate the rise and run from P₁ (x₁,y₁) to P₂ (x₂,y₂) then:

rise (from P₁ to P₂) = \(\displaystyle \Delta y\) = y₂ - y₁ .................. and

run (from P₁ to P₂) = \(\displaystyle \Delta x\) = x₂ - x₁

so,
rise= y2-y1
rise= 8-4
rise=4

the rise is 4 ...........is this correct?..............................No - see response #10
and the run
run= x2-x1
=7-5
=2
the run is 2 ...........is this correct?..............................No - see response #10

 

[eddy2017]

can i calculate it by plotting the two points and then rising and running as the points dictate?. if i can what did i do wrong in the graph i attached?
i replotted them again and do the rise and run on the graph and i counted 12 going up. the same rise that skeeter's graph has?!
i saw this method on a tutorial on finding the slope but to find it we find how much we rise and how far we run, so is it not the same?. is it not applicable here..
or am i doing something wrong?

 

[Deleted member 4993]

so,
rise= y2-y1
rise= 8-4
rise=4
is this correct?
the rise is 4
and the run
run= x2-x1
=7-5
=2
the run is 2

two points P1 (2,-4) to P2 (7,8)

rise= y2-y1
rise= 8- (-4) = 8 +4 = 12

and the run
run= x2-x1
=7-2
=5
the run is 5

 

[eddy2017]

two points P1 (2,-4) to P2 (7,8)

rise= y2-y1
rise= 8- (-4) = 8 +4 = 12

and the run
run= x2-x1
=7-2
=5
the run is 5

oh yes, i see, i missed the sign!.
wow, thanks doc!!!
one thing i dont get. why i rise 12 units but run 5 to the right.
when i plot the point (7,8) and start to run towards it once i hit 12 ( I hit it at unti 8 on quadrant 1)
why i do run 5 units to the right, don't get it
if i start at 7 and rise until 8 where i plot (7,8)
should i not run 7?.

 

[Deleted member 4993]

Find the rise in moving from point P 1(2,-4) to p 2 (7,8)

two points P1 (2,-4) to P2 (7,8)​

​

rise= y2-y1​

rise= 8- (-4) = 8 +4 = 12​

​

and the run​

run= x2-x1​

=7-2​

=5​

the run is 5​

 

[eddy2017]

two points P1 (2,-4) to P2 (7,8)​

​

rise= y2-y1​

rise= 8- (-4) = 8 +4 = 12​

​

and the run​

run= x2-x1​

=7-2​

=5​

the run is 5​

Ok got it, so the method discussed in the YouTube video doesn't always work.

 

[eddy2017]

Ok got it, so the method discussed in the YouTube video doesn't always work.

it is better to go with the formula.

 

[Steven G]

skeeter if i want to know how much the rise is ?. how do i go about it?

You count! -4 to 8 is how much?

 

[eddy2017]

You count! -4 to 8 is how much?

12
the rise is 12. thanks.
and the graph is okay too. i just checked it now and yes the rise is 12 in the graph. how dumm of me!

 

[eddy2017]

i got it now!