practice test 105

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Algebra 2
Practice Quiz 111

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Answer.

1. 12,000,000 in scientific notation is ? 12 x 10⁶ 120 x 10⁵ 12000000 x 10⁷ 1.2 x 10⁷	2. Which is the x-intercept of 4x + 2y = 10 ? 5/2 -5/2 5
3. Which is a solution to 4x + 2y > 10 ? (1,-6) (-1,6) (-1,-6)	4. Which is the y-intercept of 4x + 2y = 10 ? 5/2 7 5

5. Which is the equation of the line thru (-1,6) and slope of 4? y = 4x + 10 y = 4x + 6 y = 4x - 4	6. Which is a solution to x² - 16 = 0 ? - 4 - 16 16 4
Solve.
7. –12 < 2x + 4 Ł 6 – 8 < x Ł 1 –12 < x Ł 6 –1 < x Ł 6	8. x – 2 Ł 5 or x + 3 ł 6 x Ł 7 or x ł - 3 x Ł - 7 or x ł 9 x Ł 7 or x ł 3
9. \| 2x + 6 \| = 12 - 9 - 3 9 3	10. \| x \| = 4 4 no solution -4

11. \| x \| = -2 - 2 no solution 2	12. \| x – 2 \| Ł 5 x Ł 7 or x ł - 3 x ł 7 or x Ł - 3 x Ł 7 or x Ł - 3
Find the slope.
13. -5x + y = 3 -5 5 -3	14. T(4,0) R(5,-2) - 2 undefined 2
15. x = -3 3 0 undefined	16. What is the slope of the line parallel to 3x + y = -7 ? - 3 undefined 3
17. What is the slope of the line perpendicular to 3x + y = -7 ? - 3 undefined 1/3
Find the equation of the line for the given information.
18. Passes thru J(4,-2) & m = 2 y = 2x - 10 y - 4 = 2(x + 2) y + 2 = 2(x - 4)	19. Passes thru A(4,0) & N(5,-2) - 2 y = -2x + 8 y -2x = 8
20. vertical line thru A(4,0) ? y = 4 x = 0 x = 4	21. horizontal line thru N(5,-2) ? y = 5 y = -2 x = -2
Answer.
22. If x & y vary directly and x = 2 , y = 5 , then y = ? when x = 8? y = 5 y = 5/2 y = 20

Sketch a graph of the following. Show these to your teacher.
23. y = 2x + 5	24. y - 2x + 5 = 0
25. 2y + 4x = 10	26. 2y - 2x > 10
27. x > 4	28. 5x - 3y Ł 10

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