What is the slope-intercept form of the line passing through # (5, 4) # and # (3, -2) #?
1 Answer
Feb 24, 2016
y = 3x - 11
Explanation:
The slope-intercept form of a straight line is y = mx + c , where m represents the gradient (slope) and c, the y-intercept.
To find m , use the
#color(blue)" gradient formula "#
# m = (y_2 - y_1)/(x_2 - x_1) # where
# (x_1 , y_1 ) " and " (x_2 , y_2 ) " are 2 coord points "# let
#(x_1,y_1) = (5,4) " and " (x_2,y_2) = (3,-2)# hence :
# m = (-2 - 4)/(3 - 5 ) = (-6)/(-2) = 3 # equation is y = 3x + c and to find c , use one of the given points on the line , say (5 , 4 ).
ie 4 = 3(5) + c → c = 4 - 15 = -11
#rArr y = 3x - 11 " is the slope-intercept form "#
