What is an equation in slope intercept form for the line that passes through the points (1,-3) and (3,1)?
y=mx+b
-3=1m+b
y=mx+b
1=3m+b
now subtract the equations
-4=-2m
m=2
now go back to either and solve for b.
-3=1m+b
y=mx+b
1=3m+b
now subtract the equations
-4=-2m
m=2
now go back to either and solve for b.