in the xy plane below, point c has coordinate (6,9). what is the equation line contains point o and c

Two points on the line are (0, 0) and (6, 9) The slope of the line including them is the change in y over the change in x m = (9 - 0) / (6 - 0) m = 1.5 y = 1.5x + b because the origin is one of the points on the line, the y intercept is zero b = 0 so the line equation is y = 1.5x