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anonymous

  • one year ago

A pair of equations is shown below: y = 8x − 9 y = 4x − 1 Part A: Explain how you will solve the pair of equations by substitution or elimination. Show all the steps and write the solution. (5 points) Part B: If the two equations are graphed, at what point will the lines representing the two equations intersect? Explain your answer. (5 points)

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  1. anonymous
    • one year ago
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    @Johnvdb

  2. anonymous
    • one year ago
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    Haha already? Alright so, very similar to the last question:

  3. anonymous
    • one year ago
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    Thats just to show you the answer. Now if we are going to use substitution and elimination

  4. anonymous
    • one year ago
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    oksy

  5. anonymous
    • one year ago
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    Alright i will draw you some things for elimination, and tell me if you don't get it

  6. anonymous
    • one year ago
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    Actually nah i don't like elimination, substitution is always easier. so, because both of these equations are equal to y, we set them equal to each other: see how 8x - 9 = y, well we can just put in 8x - 9 = 4x - 1 then we solve: 8x - 9 = 4x - 1 4x = 8 x = 2

  7. anonymous
    • one year ago
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    The reason we can plug in the equations and set them equal to each other is because they both are equal to y, and this is very helpful for the future. And the answer to part 2 is in the attachment I sent earlier

  8. anonymous
    • one year ago
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    ohh!

  9. anonymous
    • one year ago
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    Now if you need me to repeat anything at all, let me know :)

  10. anonymous
    • one year ago
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    well where exactly do they intersect

  11. anonymous
    • one year ago
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    Alright now it's your turn :) pull up desmos.com/calculator

  12. anonymous
    • one year ago
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    i did

  13. anonymous
    • one year ago
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    you're going to go on the left side and type the equation into one box, then click right underneath that box and type the next equation in and it will graph it for you, and you will see where they intersect

  14. anonymous
    • one year ago
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    1.7?

  15. anonymous
    • one year ago
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    screenshot what you're doing and send it as an attachment so I can help you with what you've got going wrong for the future

  16. anonymous
    • one year ago
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    can screen shot on this P.C

  17. anonymous
    • one year ago
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    darn ok, well let me give you a quick tutorial then

  18. anonymous
    • one year ago
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  19. anonymous
    • one year ago
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  20. anonymous
    • one year ago
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    That's the right one, ok so all you have to do is click right in that box and type, and the graph will pop up. You can either type in 8x - 9 or y = 8x - 9 (the calculator knows what you're saying either way)

  21. anonymous
    • one year ago
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    now right underneath that box, you can click and another box will be outlined and let you type in it

  22. anonymous
    • one year ago
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    ok hold on

  23. anonymous
    • one year ago
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  24. anonymous
    • one year ago
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    They intersect at (2,7)

  25. anonymous
    • one year ago
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    YES THATS WHAT I GOT!!!!!!!!

  26. anonymous
    • one year ago
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    There you go :) Now I completely believe in your ability to use this tool in the future, it can solve so many of your questions, but if you still aren't sure just tag me and I will do my best to help you :)

  27. anonymous
    • one year ago
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    THANKS APRECIATE IT

  28. anonymous
    • one year ago
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    Now go forth and do great things!

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