In slope - intercept form, Equation of the straight line is y = mx + c where, 'm' is the slope of the line 'c' is the y - intercept Here, given that slope of the line = - 2 ⇒ m = - 2 From the figure, we can see that (3 , 4) is a point on the line. By submitting the above in the equation of straight line, we get the y - intercept m = - 2 , x - 3 and y = 4 ∴ y = mx + c ∴ 4 = (- 2) (3) + c ∴ 4 - (- 6) = c ∴ c = 10 Therefore, the y intercept of the line is 10