Mathematics for IGCSE & O level - Coordinate Geometry (Section 4 - No. 11)
What is the y-intercept of the line that passes through the points (1, 2) and (3, 8)?
-1
-2
1
3
설명
Gradient = (8-2)/(3-1) = 3. Using point-slope form: y - 2 = 3(x - 1) => y = 3x - 1. Therefore, y-intercept = -1.