need help with 13 and 15, please show work, so I can understand how to figure problems out, thank you

Using and Interpreting Concepts Finding the Equation of a Regression Line In Exercises 13-22, find the equation of the regression line for the given data. Then construct a scatter plot of the data and draw the regression line. (Each pair of variables has a significant correlation ] Then use the regression equation to predict the value of y for each of the given x-values, if meaningful. If the x-value is not meaningful to predict the value of y, explain why not. 13. Age and Blood Pressure The ages (in years) of seven men and their systolic blood pressures Age, x 17 26 37 48 50 6.8 72 Systolic blood pressure, y 110 124 146 140 200 192 200 (a) x = 18 years (b) x = 71 years (c) x = 29 years (d) x = 55 years 14. Age and Vocabulary The ages (in years) of seven children and the number of words in their vocabulary Age, x 3 4 5 6 2 3 Vocabulary size, y 1100 1300 1500 2100 2600 460 1200 (a) x = 2 years (b) x = 3 years (c) x = 6 years (d) x = 12 years 15. Hours Studying and Test Scores The number of hours 13 students spent ATA studying for a test and their scores on that test Hours spent studying, x 0 2 5 5 Test score, y 40 41 51 48 64 69 73 Hours spent studying, x 5 6 6 Test score, y 75 68 93 84 90 95 (a) x = 3 hours (b) x = 6.5 hours (c) x = 13 hours (d) x = 4.5 hours