Question 742372
find the equation for the coordinates (0,-3) (2,3) 
I think you are referring to the equation of a line, y=mx+b, m=slope, b=y-intercept
slope can be found when you have 2 points on the line which you have.
slope=∆y/∆x=(y1-y2)/(x1-x2)=(3-(-3))/(2-0)=6/2=3
equation: y=3x+b
solve for b, using any one of the given points(2,3)
3=3*2+b
b=-3
equation of the line given coordinates are on: y=3x-3
You got the correct answer and hopefully you now have a better understanding of the problem.