## anonymous one year ago http://prntscr.com/8n6jqs

1. anonymous

Substitute x and y as 2 and 1 and then note down that equation. Do the same with 3 and 4 . What you will then get are simultaneous linear equations in two variables. Solve them for x1 and y1 and then substitute the found values in the original eqaution

2. anonymous

3. Astrophysics

Well first find the slope, using the following formula: $m = \frac{ y_{2}-y _{1} }{ x _{2}-x _{1} }$ where your coordinates represent $(x_1,y_1)~~\text{and}~~(x_2,y_2)$ Once you manage to get that, plug in m and your first coordinates in the point - slope form: $y-y _{1}=m(x-x _{1})$

4. anonymous

y=3x-5?

5. Astrophysics

6. anonymous

7. Astrophysics

No, please go over what I've said, it will take you 5 minutes to do, rather than wasting time to guess.

8. anonymous

m=3

9. Astrophysics

Yes! Now you have the slope

10. Astrophysics

Now do the next step

11. anonymous

y−1=3(x−2) so my answer is a?

12. Astrophysics

Yes!

13. anonymous

Thnx

14. Astrophysics

Wasn't that so much better than just guessing? :)