16. Write the equation of the line with slope 4 and y-intercept (0, –5). Then graph the line.
17. Find the slope and y-intercept.
–x – 4y = –32
18. Rewrite the equation 2x – 9y = –72 as a function of x.
19. Find the slope and the y-intercept.
y = 7x
20. Graph the inequality.
x >= 5
21. The equation y = print_coeff(m,1)x print_const(b) describes the amount of money a class of students might earn from candy bar sales. What are the slope and y-intercept of this line?
22. Find the slope and the y-intercept.
y = –9x – 3
23. Graph f(x) = –2x + 2.
24. Find the slope of any line parallel to the line through points (18, 3) and (6, 4).
25. An airplane covered 13 miles of its route while decreasing its altitude by 18,000 feet. Find the slope of the airplane's line of descent. Round to the nearest hundredth. [Hint: 1 mi = 5280 feet.]