Finding an equation with only two points

    In algebra, we learned how to find an equation with only two points. First you have two to y-y/x-x. For example (5,10) (9,14), so you do 14-10/9-5 =    4/4 = 1. So you got m= 1. So y=1 x + b. Now you need to find b so you get one of the points and input it into the equation. so 10=1 (5) + b. 10= 5 + b ,then you subtract 10-5 and get b=5. So your equation is y=1 x + 5.
    What I learned was how to find an equation with only two points. At first this was really hard, and I didn't know how to do it. Then I got help from Mr.Erickson and the help really helped me. I always get help when I don't get the lesson.