Remember that
the equation of the line in point slope form is equal to
y-y1=m(x-x1)
step 1
Find out the slope
m=(7-4)/(13-5)
m=3/8
step 2
Find out the equation of the line
we have two possibilities
First
m=3/8
point (5,4)
substitute
y-4=(3/8)(x-5)
Second
m=3/8
point (13,7)
substitute
y-7=(3/8)(x-13)