Properties of Real Numbers State the property of real numbers being used. (a+b)(a-b)-(a-b)(a + b) Substituting x for (a+b) and y for (a-b) we see: (a+b)(a-b)=(a-b)(a+b) xy = yx We recognize this expression as the Commutative Property of Multiplication. Demand for Soft Drinks A convenience store manager notices that sales of soft drinks are higher on hotter days, so he assembles the data in the table. (a) Make a scatter plot of the data. (b) Find and graph a linear function that models the data. (c) Use the model to predict soft drink sales if the temperature is 95F. High temperature (F) 55 58 64 68 70 75 80 84 Given that Number of cans sold 340 335 410 460 450 610 735 780 P(2.0) and 2(-4,8) al are two points in the coordinate plane.