Equation of a straight line: y = mx + c. m is the gradient while c is the y-intercept. gradient m = (y2 - y1) / ( x2 - x1) from the given coordinates, x1 = 6, x2 = -6, y1= 4, y2 = 4 m = (4 - 4) / ( -6 - 6) = 0/12 = 0 to find y- intercept, we solve for c using any of the given coordinates. 4 = 0x + c c = 4 the equation of the line: y = 0x + 4 Standard form = ax + by = c 0x + y = 4 y = 4
