Y intercept: when x = 0 Coordinate will be (0, y) Look at the graph Solution: y intercept: (0, 140) Slope is the rate of change (20,100) (0,140) Slope formula: (y2-y1)/(x2-x1) (140-100)/(0-20) = 40/-20 = -2 Solution: the slope is -2 Now use formula: f(x) = mx + b m = slope, b = y intercept Solution: function: f(x) = -2x + 140
