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3-4: SlopeIntercept Form Warm-up (Solve A box contains 5 green marbles, 4 blue marbles and 6 red marbles. A marble is it only): picked at random. Without replacing the first marble, another marble is taken from the box. Calculate the probability that: (a) the first marble green and the second marble red (b) two marbles are the same color. What is a Y- The y-intercept of a line is the y-coordinate of the point where the line crosses the yIntercept? axis. y-intercept x-axis y-axis Slope Formula = m slope formula ; (x1,y1) = (0,b) and (x2,y2) = (x,y) simplify y–b=m∙x Multiplication Property of Equality y = mx + b Slope y-intercept What is the Slope-intercept Nonproportional linear relationships can be written in the form y = mx + b. This is Form? called the slope-intercept form. Example 1: State the slope and the y-intercept of the equations. A) y = -5x + 3 B) y = x - 6 Example 2: C) Write an equation in slope-intercept form for the graph shown. D) Write an equation of a line in slopeintercept form with a slope of and a y- intercept of -3. Example 3: A taxi fare y can be determined by the equation y = .50x + 3.50, where x is the number of miles traveled. E) Graph the equation F) Interpret the slope and the y-intercept.