What is the x-intercept of the line that contains the points (-4, 1) and (-7, 2) in the standard (x, y) coordinate plane?
1 Answer
Apr 17, 2017
(see below)
Explanation:
Find the equation of the line:
-
Find the gradient using
dy/dx
(1-2)/(-4+7) = -1/3 -
Take 1 coordinate point and use
y-y_1 = m (x-x_1) to find the equation of the line
y-1 = -1/3 ( x - (-4) )
y-1 = -1/3x - 4/3
y = -1/3x - 1/3 -
substitute 0 into y to find the x-intercept.