Mathematics for IGCSE & O level - Coordinate Geometry (Section 4 - No. 7)
Determine the equation of a line that passes through the point (1, 4) and has a gradient of 3.
y = 3x + 1
y = 3x - 1
y = x + 3
y = -3x + 7
解释
Use the point-slope form y-4 = 3(x-1), y-4 = 3x - 3, thus y=3x-1