The answer is A, y=-2x+3.
Explanation: To find slope, you plug the given points into the equation (y2-y1)/(x2-x1), and the slope is the coefficient of x. (1-3)/(1-0) = (-2) / (1), or -2. We also can clearly see that the y-intercept is 3 from the given graph. y=(slope)x + (y-intercept), so y = -2x + 3
