Mathematics for IGCSE & O level - Coordinate Geometry (Section 4 - No. 20)
Which of the following equations represent parallel lines?
y = 2x + 3
y = -2x + 3
2x + y = 4
y - 2x = 1
解释
Parallel lines have the same gradient. The equations are y = 2x + 3 & y = 2x + 1