Most of these problems you can cut and paste into mathway.com to correct. I will work out some here as well.
1. Check the answers to previous quizzes on the Answer tab on the website
2. 1. pick (0,2) as the first point, since b=2 is the y intercept. Since the slope is -1/3, go over 3 and down 1 to get (3,1)
2. The blank must be 3 since then there are 2 different values for x when x = 3
3. y = 2x + 3
use mathway
4. the value of y for A is bigger than the value of y for B
5. 10(5)(8)
6. 4(1)(8)
7. |x-3| could be 6 or -6, so x can be 9 or -3
8. use mathway
9. see examples of notation for piecewise functions in text
10. add 6 to each piece then divide by 3 to the 3<x<6
11. -2y<8, y>-4
New problems:
1. -4x^2 + 6x – 1 + (-3x^2 – 2x + 3), or -7x^2 +4x + 2
2. -4x^2 + 6x – 1 - (-3x^2 – 2x + 3) or -4x^2 + 6x – 1 +3x^2 + 2x - 3 or -x^2 + 8x -4
3. 2(-4x^2 + 6x – 1) -3 (-3x^2 – 2x + 3) or -8x^2 + 12x -2 – (-9x^2 -6x + 9) or -8x^2 + 12x -2 +9x^2 z+6x - 9 or x^2 + 18x – 11
4. use mathway. cut and paste: ( -4x^2 + 6x – 1) (-3x^2 – 2x + 3)
5. use mathway.com cut and paste: 2( -4x^2 + 6x – 1) (3)(-3x^2 – 2x + 3)
6. mathway: -4x^2 + 6x – 1 - (-3x^2 – 2x + 3) + 2(-4x^2 + 6x – 1)
7-14. Use mathway