jehan.the.great

06-01-2006, 08:36 PM

write the equation of the lines that passes through the given two points:

a.(8, 1) (-2, -17)

?????????????

i'm soooooo lost

a.(8, 1) (-2, -17)

?????????????

i'm soooooo lost

View Full Version : equation through the points (8, 1) and (-2, -17)

jehan.the.great

06-01-2006, 08:36 PM

write the equation of the lines that passes through the given two points:

a.(8, 1) (-2, -17)

?????????????

i'm soooooo lost

a.(8, 1) (-2, -17)

?????????????

i'm soooooo lost

pka

06-01-2006, 08:47 PM

Well the change in y is –18.

The change in x is –10.

Slope is change in y divided by change in x.

The change in x is –10.

Slope is change in y divided by change in x.

jehan.the.great

06-01-2006, 08:48 PM

??

still lost

i have no clue what to do with the equation

still lost

i have no clue what to do with the equation

guntram

06-01-2006, 08:58 PM

(x-8)/(-10)=(y-1)/(-17)

So

-17x+136=-10y+10

10y-17x=-126

So

-17x+136=-10y+10

10y-17x=-126

pka

06-01-2006, 09:00 PM

Go to your text material.

Look up slope.

Then look up point slope form.

That will tell you how to do this problem.

The point being that we will not do it for you.

(Well maybe Soroban or guntram will?)

Look up slope.

Then look up point slope form.

That will tell you how to do this problem.

The point being that we will not do it for you.

(Well maybe Soroban or guntram will?)

guntram

06-01-2006, 09:11 PM

y=1.7x-12.6

slope is 1.7

slope is 1.7

guntram

06-01-2006, 09:30 PM

I have a mistake

the right answer y=1.8x-13.4

the right answer y=1.8x-13.4

jehan.the.great

06-02-2006, 12:47 AM

ok

thanks soooooo much!

thanks soooooo much!

lrivetz

06-02-2006, 05:40 AM

I have a mistake

the right answer y=1.8x-13.4

I tried solving the problem and came out with 1.8 but lost where -13.4 came from?

I used y1 -y2 / x1 - x2

1 - (-17) = 18

8 - (-2) = 10

18/10 = 1.8

How did you get -13.4 and where?

the right answer y=1.8x-13.4

I tried solving the problem and came out with 1.8 but lost where -13.4 came from?

I used y1 -y2 / x1 - x2

1 - (-17) = 18

8 - (-2) = 10

18/10 = 1.8

How did you get -13.4 and where?

soroban

06-02-2006, 10:47 AM

Hello, jehan.the.not.so.great!

Write the equation of the lines that passes through: (8, 1) (-2, -17)

You're expected to know something about lines . . . like some formulas?

Slope of line through (x_1,y_1) and (x_2,y_2):\;\;m\;=\;\frac{y_2\,-\,y_1}{x_2\,-\,x_1}

Equation of line through (x_1.y_1) with slope m:\;\;y\,-\,y_1\;=\;m)x\,-\,x_1)

We're given two points: \,P(8,1),\;Q(-2,-17)

The slope of line PQ is: \,m\;=\;\frac{-17\,-\,1}{-2\,-\,8}\;=\;\frac{-18}{-10}\;=\;\frac{9}{5}

'

The line through (8,1) with slope m\,=\,\frac{9}{5} is: \;y\,-\,1\;=\;\frac{9}{5}(x\,-\,8)

Simplify and we get: \: y \;= \;\frac{9}{5}x\,-\,\frac{67}{5}

. . . and don't use decimals in algebra!

Write the equation of the lines that passes through: (8, 1) (-2, -17)

You're expected to know something about lines . . . like some formulas?

Slope of line through (x_1,y_1) and (x_2,y_2):\;\;m\;=\;\frac{y_2\,-\,y_1}{x_2\,-\,x_1}

Equation of line through (x_1.y_1) with slope m:\;\;y\,-\,y_1\;=\;m)x\,-\,x_1)

We're given two points: \,P(8,1),\;Q(-2,-17)

The slope of line PQ is: \,m\;=\;\frac{-17\,-\,1}{-2\,-\,8}\;=\;\frac{-18}{-10}\;=\;\frac{9}{5}

'

The line through (8,1) with slope m\,=\,\frac{9}{5} is: \;y\,-\,1\;=\;\frac{9}{5}(x\,-\,8)

Simplify and we get: \: y \;= \;\frac{9}{5}x\,-\,\frac{67}{5}

. . . and don't use decimals in algebra!

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