Question

A line passes through the points (8, –1) and (–4, 2).

What is the y-intercept of this line?
A. –4
B. –1
C. 1
D. 4

Answer 1

Explanation:

With the given points, we can first find the gradient of the line:

gradient = (2+1)/(-4-8)

= -1/4

We also know that the formula of a straight line is

Y = mX+C, where m is gradient and C is y intercept.

Hence by substituting the coordinates (-4, 2) and the gradient -1/4, we get:

2 = (-1/4)(-4) + C

C = 1. Hence, Answer is C.

(Actually, you can just draw a straight line connecting the 2 coordinates and find out the y intercept)