Find the slope using the ratio of delta y over delta x.
[tex]m=\frac{3-4}{-2-(-1)}[/tex]
[tex]m=\frac{-1}{-1}[/tex]
[tex]m=1[/tex]
Find the y-intercept by plugging in a point.
[tex]y=x+b[/tex]
[tex]4=-1+b[/tex]
[tex]b=5[/tex]
[tex]y=x+5[/tex]
Hope this helps.
頑張って!
