Question

Write an equation of a line that passes through (9,-5) and (3,-5).

Answer 1

first find the slope of this line, do you know how to do that?

Answer 2

\[\frac{y_1-y_2}{x_1-x_2}=slope\]

Answer 3

plug in your points into (the above) slope formula.

Answer 4

\(\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
&(9\quad ,&-5)\quad &(3\quad ,&-5)
\end{array}
\\\quad \\

\large slope = m= \cfrac{rise}{run} \implies \cfrac{y_2-y_1}{x_2-x_1}
\\ \quad \\

\bf y-y_1=m(x-x_1)\quad \textit{plug in your values to get the equation}\)

Answer 5

@cuitiefromthesouth2, we need your cooperation to help you, we can't just do your work, please say something.....

Answer 6

sorry I was trying to work out the problem

Answer 7

Oh, go a head and work in here PLEASE! We will correct you if your wrong.

Answer 8

okay

Answer 9

m=-5-(-5)/3-9

Answer 10

=0/6

Answer 11

0/-6

Answer 12

cuitiefromthesouth2, the other way, not -5-(-5)/3-9, IT IS 3-9/-5-(-5)

Answer 13

=-6/0

Answer 14

yep! The slope is undefined and REMEMBER:
if slope is undefined the line is vertical, because in (any) vertical the x coordinates are all same. lets take a vertical line

Answer 15

See?

Answer 16

yea , thank you

Answer 17

yes

Answer 18

So how would you write the equation of your line?

Answer 19

In my example the equation would be x=a, what about your's?

Answer 20

3-9/-5-(-5) = -6/0, which is undefined ?

Answer 21

@SolomonZelman

Answer 22

yes, so it is x=-6