Mathematics for IGCSE & O level - Coordinate Geometry (Section 2 - No. 19)
A line has a gradient of 2 and passes through the point (1, 3). What is the equation of this line?
y = 2x + 1
y = 2x - 1
y = x + 2
y = 3x + 2
설명
Using y - y1 = m(x - x1), y - 3 = 2(x - 1) => y = 2x + 1