Recall that y = mx + b is the slope-intercept form of the equation of a line. The equation y = -3.5x + 50 represents the number of points y, on your card after x games are played at an arcade. 3.5 points are deducted from your 50-point card for each game that you play. Identify the slope in the linear equation y = -3.5x + 50. What is the slope, m, of this line?