Ok I think I've worked this out incorrectly so if someone could point me in the right direction that would be great.....

The question is find the equation of a line that passes through (-1,5) and (2,-4)

I know that

y=mx+c to find M = change in y value divide by change in x value=

2- (-1)/5-(-4) = 3/9 =1/3

so y = 1/3x=c

so 5=1/3(-1)+c

5= -1/3+c

5+-1/3 = c

4 2/3 = c so

y= 1/3x+ 14/3

You see why I need help right?