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Lesson 8: Systems of Linear and Quadratic Equations

Check my work
1. Solve the system of equations.
y = 2x^2 - 3
y = 3x - 1
a. no solution
b. (-1/2, 5), (2, -5/2)
c. (-1/2, -5/2), (2,5)***
d. (1/2, 5/2), (2, 5)
2.how many real number solutions does the equation have 0 = -3x^2 + x - 4
a. 0***
b. 1
c. 2
d. 3
3. solve the equation by completing the square. If necessary round to the nearest hundredth.
x^2 - 18x = 19
a. 1; 19
b. -1; 19***
c. 3; 6
d. -3; 1
4. solve. x^2 - 81 = 0
a. 0
b. -9
c. -9, 9***
d. 9
5. which model is most appropriate for the data shown in the graph below? (need wedsite to know the problem)
a. quadratic
b. linear
c. exponential***
d. line
for questions 6-9, match the equation to its corresponding graph.
(need wedsite to know the problem)
a, b, c, d
6. a y=-2x^2+2
7. d y=-x^2
8. c y=2x^2
9. b y=3x^2-4
Graph the quadratic functions y = -2x^2 and y = -2x^2 + 4 on a separate piece of paper. Using those graphs, compare and contrast the shape and position of the graphs.

y=-2x^2+4 is just 4 units up from y=-2x^2

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16 answers
  1. #1 - 4, correct
    #5, can't tell , can't see any graph

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    Reiny
  2. is the last one correct

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  3. y=-2x^2+4 is just 4 units up from y=-2x^2 ?

    yes

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    Reiny
  4. 100% All Correct Just Did it and got a 100%

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  5. gamenight is right :) all right

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  6. Here are the correct answers;
    1. C (-1/2, -5/2), (2,5)
    2. A 0
    3. B -1;19
    4. C -9,9
    5. C Exponential
    MATCHING
    6. A
    7. D
    8. C
    9. B
    10. ESSAY

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  7. Ro is right I got 9/9 with upgraded 3 possible points. Thank you

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  8. You're welcome!

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  9. Gameknight is right i got a 9/9 and 3 possible points.

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  10. thanks SOOOO much everyone here!! :3

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  11. Any answers on Unit 7 lesson 9 Equations and Inequalities unit tests? There is 18 questions on part 1! Please help me I need it today!!!!

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  12. Ro is 100%. thanks Ro your a life saver love you

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  13. Gameknight is correct. all the answers are 100% accurate. Thank you!

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  14. Thanks so much Ro and GameKnight! True lifesavers

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  15. Anyone got the essay question tho

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  16. Essay answer please i wanna know if im right

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