Find the slope of the line which is parallel to x + 2y + 3 = 0.

Given, ⇒ x + 2y + 3 = 0 ⇒ 2y = -x - 3 ⇒ y = Comparing above equation with y = mx + c we get, Slope = Since, slope of parallel lines are equal. Hence, slope of line parallel to x + 2y + 3 = 0 is .