## anonymous one year ago What is the equation of the line that passes through the points (−1, 3) and (1, 11)?

1. Nnesha

do you know the formula to find slope ?

2. anonymous

y=mx+b

3. Nnesha

that's the equation we need it later but first we have to find slope $\huge\rm \frac{ y_2 -y_1 }{ x_2 -x_1 }$ and plug in order pair where x and y are $\huge\rm (x_1 ,y_1) (x_2 ,y_2)$

4. anonymous

so it would be 11-3 over 1-(-1)

5. Nnesha

yes yes right !! :=) solve

6. anonymous

8 over 2

7. anonymous

then it would be 4

8. Nnesha

yes right now use that equation plug in m balue m=slope and pick one of order pair replace xand y by their values solve for b

9. anonymous

ok thank u

10. Nnesha

let me know what you get!

11. anonymous

i dont understand what u said^

12. Nnesha

cool and thanks for telling me :=) so $\huge\rm y = mx+b$ m=4 now you can pick one of order pair where x and y values are (x,y) and then substitute into the equation let's say (1,11) so replace x by 1 y by 11 and m by 4 solve for b

13. anonymous

7?

14. Nnesha

$\huge\rm \color{red}y=\color{green}{m}\color{blue}{x}+b$ $(\color{blue}{1},\color{Red}{11})$

15. anonymous

16. Nnesha

yes b =7 $\huge\rm y=\color{green}{m}{x}+\color{ReD}{b}$ m=4 b=7 plug in &&& done!

17. anonymous

omg thanks

18. Nnesha

my pleasure