Mathematics for IGCSE & O level - Coordinate Geometry (Section 1 - No. 1)
Which of the following equations represents a line with a negative gradient?
y = 2x + 1
y = -3x + 4
y = x - 2
y = -x - 5
คำอธิบาย
A negative gradient means the slope goes downwards from left to right. The coefficient in front of the x must be negative.