The equation of a line is Y=mx+b You know that the slope is -2 and the slope is 'm' so sub it into the equation. Y=-2x+b To have an equation of a line you need the 'b' or 'y' intercept and the slope. This means you have to find the 'b' because you already know the slope which is -2. To find the 'b' you have to sub in the coordinates and then solve for 'b' Y=-2x+b (x,y) (3,0) 0=-2(3)+b 0=-6+b 6=b Therefore the equation of the line is Y=-2x+6 <span />
