The line equation in slope-intercept form is , where m is the slope and b is the y-intercept.
The line parallel to has the same slope
.
Replace m with, and (x1, y1) with (-1,2) in point slope form equation
(Apply distributive law: a(b + c) = ab + ac)
(Add 2 to each side)
(Additive inverse property:
)
(Additive identity property:
)
(Add:
)
The slope-intercept form line equation is