Mathematics for IGCSE & O level - Coordinate Geometry (Section 3 - No. 20)
A line has a slope of -3 and passes through the point (1, 2). What is the equation of the line?
y = -3x - 1
y = -3x + 5
y = 3x - 1
y = 3x + 5
Vysvetlenie
Use point-slope form: y - 2 = -3(x - 1) => y - 2 = -3x + 3 => y = -3x + 5