Write the equation of the line that passes through the points (1,4) and (5,8) in standard form.

The slope m=(y2-y1)/(x2-x1)
m=(8-4)/(5-1)
m=4/4=1
now let s solve the constant b
y=x+b
8=5+b
8-5=b
3=b
now we know the slope m=1 and the constant b=3

let s write the equation is
y=x+3 < Final answer

Cbottom left is the correct one.