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anonymous

  • one year ago

Can someone tell me how I should go about this problem?

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  1. anonymous
    • one year ago
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    Part A: Write an algebraic expression for 8 more than 5 times a number. Part B: What is another way this expression can be read?

  2. mathstudent55
    • one year ago
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    Start by choosing a variable to represent the number. Which letter do you like as a variable, x, n, a, b, ...? It's your choice.

  3. anonymous
    • one year ago
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    x

  4. anonymous
    • one year ago
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    i believe its x/5?

  5. mathstudent55
    • one year ago
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    Great. We'll use x. How do you show 5 times a number if the number is x?

  6. mathstudent55
    • one year ago
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    No. x/5 means x divided by 5. Remember that a fraction means division. We want to show 5 times x, not x divided by 5.

  7. anonymous
    • one year ago
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    wait no sorry 5*x

  8. anonymous
    • one year ago
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    or 5 ⋅ x

  9. mathstudent55
    • one year ago
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    Correct, but in math, we are lazy, so we want to write as little as possible, so we normally shorten 5 * x to simply 5x.

  10. mathstudent55
    • one year ago
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    5x means 5 times the number represented by the variable x, or simply, 5 times a number. Now we have another step. We need to show 8 more than 5x.

  11. mathstudent55
    • one year ago
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    For example, 8 more than 2 is 10, and 8 more than 10 is 18. What operation do you do with 8 and 2 to end up with 10? What operation do you do with 8 and 10 to end up with 18?

  12. anonymous
    • one year ago
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    Add

  13. mathstudent55
    • one year ago
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    Exactly. To show a number is 8 more than another number, you add 8 to the number. Here we need to add 8 to 5x. We end up with 5x + 8

  14. mathstudent55
    • one year ago
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    |dw:1438811427858:dw|

  15. anonymous
    • one year ago
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    Wow

  16. mathstudent55
    • one year ago
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    This answers part A.: 5x + 8

  17. mathstudent55
    • one year ago
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    Now we can look at part B.

  18. mathstudent55
    • one year ago
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    We need to read the expression 5x + 8 in a different way. You can say: "5 times a number more than 8" Also: "5 times a number increased by 8" Also: "8 more than the product of 5 and a number"

  19. anonymous
    • one year ago
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    i see

  20. anonymous
    • one year ago
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    Thank you (: @mathsudent55

  21. anonymous
    • one year ago
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    * @mathstudent55

  22. mathstudent55
    • one year ago
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    You're welcome.

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