pick 2 random ascending x values and calculate the difference delta to get the slope
[tex] \delta \: x = - 2 - ( - 1) = 1[/tex]
so your slope is "1"
and as you can see, that x=0 at y=3, so your y-intercept is 3
thats it, your function is
[tex]f(x) = x + 3[/tex]
