Mathematics for IGCSE & O level - Coordinate Geometry (Section 1 - No. 22)
If a line passes through (2, -1) and has a gradient of 3, what is the equation of the line?
y = 3x + 7
y = 3x - 7
y = 3x + 5
y = -3x + 7
설명
Using point-slope form: y - (-1) = 3(x - 2) => y + 1 = 3x - 6 => y = 3x - 7