3. Find the y-intercept.
–x + 3y = 15
A) (5, 0) B) (0, –15) C) (0, 5) D) (–15, 0)
6. Write the equation of the line passing through (4, 4) and (4, 2).
A) y = 4 B) y = –2x C) x = 4 D) y = x + 4
8. A roof rises 9.75 ft over a horizontal distance of 17.24 ft. What is the slope of the roof to the nearest hundredth?
A) 1.91 B) 1.77 C) 0.65 D) 0.57
9. Given f(x) = 5x2 – 3x + 1, find f(–2).
A) 15 B) 27 C) –13 D) –25
10. Find the slope and y-intercept.
x = –8
A) Slope: undefined; y-intercept: (0, –8) C) Slope: undefined; y-intercept: none
B) Slope: 0; y-intercept: none D) Slope: 0; y-intercept: (0, –8)
11. One day, the temperature at 8:00 A.M. was 41°F, and by 1:00 P.M. the temperature was 61°F. What was the hourly rate of temperature change?
A) 6°F/h B) 3°F/h C) 4°F/h D) 5°F/h
16. Graph the inequality.
y >= 1
17. Rewrite the equation y = print_coeff(m,1)x print_const(b) as a function of x.
18. Graph the inequality.
y >= 3x
19. Find the slope of any line parallel to the line through points (15, 1) and (4, 2).
20. Graph the inequality.
x – y >= 2
21. Given g(x) = print_coeff(m,1)x print_const(b), find g(print_coeff(n,1)a).
22. 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?
23. Rewrite the equation 4x – 6y = –30 as a function of x.
24. Write the equation of the line passing through (3, –7) and (–6, –7).
25. Write the equation of the line that passes through point (–2, 3) with a slope of –4.