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carlenstar281

  • 3 years ago

Please help me I don't understand?? study guide :(

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  1. carlenstar281
    • 3 years ago
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    what are the coordinates of the x- intercept of the line 3x4y=12

  2. carlenstar281
    • 3 years ago
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    I know what the answer is (4,0) but why?

  3. hartnn
    • 3 years ago
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    to get x-intercept, put y=0 in line 3x+4y=12

  4. jim_thompson5910
    • 3 years ago
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    like hartnn is saying 3x+4y=12 3x+4(0)=12 ... plug in y = 0 3x + 0 = 12 3x = 12 x = 12/3 x = 4 So the x-intercept is the point (4,0)

  5. jim_thompson5910
    • 3 years ago
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    to find the y-intercept, just plug in x = 0 and solve for y

  6. carlenstar281
    • 3 years ago
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    Thank you Thank you for your help :)

  7. jim_thompson5910
    • 3 years ago
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    yw

  8. carlenstar281
    • 3 years ago
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    do you mind giving me a practice problem? So I can figure it out myself i really appreciate it

  9. jim_thompson5910
    • 3 years ago
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    find the y-intercept of 5x + 10y = 30

  10. carlenstar281
    • 3 years ago
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    just make up one please :)

  11. hartnn
    • 3 years ago
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    to get y-intercept, put x=0 in 5x+10y=30

  12. carlenstar281
    • 3 years ago
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    since my test is multiple choice can you give me answers to choose from?

  13. hartnn
    • 3 years ago
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    not required, but sure, 1) (0,-3) 2) (0,3) 3) (3,0) 4) (0,6)

  14. hartnn
    • 3 years ago
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    having problems ?

  15. carlenstar281
    • 3 years ago
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    yes i got x=10?

  16. carlenstar281
    • 3 years ago
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    I suck at math

  17. hartnn
    • 3 years ago
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    how you can get x=10 when i told you to put x=0 to find y-intercept :O

  18. carlenstar281
    • 3 years ago
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    i have no idea why

  19. carlenstar281
    • 3 years ago
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    one sec

  20. hartnn
    • 3 years ago
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    |dw:1362727211824:dw|

  21. hartnn
    • 3 years ago
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    can you find y from 5(0)+10y=30 ?

  22. carlenstar281
    • 3 years ago
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    sorry i got it though it would be (3,0) yes

  23. hartnn
    • 3 years ago
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    you got y=3 then, right ?? and intercepts are of the form (x,y) y co-ordinate comes after comma so, would you like to revise your answer ?

  24. carlenstar281
    • 3 years ago
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    yes its (0,3)

  25. hartnn
    • 3 years ago
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    now its correct :)

  26. hartnn
    • 3 years ago
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    want more examples?

  27. carlenstar281
    • 3 years ago
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    yes please and thank thank you for helping me :)

  28. carlenstar281
    • 3 years ago
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    I actually understand it now!!

  29. hartnn
    • 3 years ago
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    oh, you are welcome :) find x intercept of the line 2x+3y = 7 this involves fraction....

  30. hartnn
    • 3 years ago
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    try first without choices

  31. carlenstar281
    • 3 years ago
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    okay ill try it :)

  32. carlenstar281
    • 3 years ago
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    okay i know this is wrong but is it (0, 2 1/3)

  33. jim_thompson5910
    • 3 years ago
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    to find the x-intercept, you plug in y = 0 not x = 0

  34. hartnn
    • 3 years ago
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    to get x-intercept, you need to put y=0, right ?

  35. carlenstar281
    • 3 years ago
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    oh wow okay one sec sorry its late

  36. hartnn
    • 3 years ago
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    no problem, take your time :)

  37. carlenstar281
    • 3 years ago
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    alright is it (0, 3 1/2) btw thanks for your patience math is just really not my subject :/

  38. jim_thompson5910
    • 3 years ago
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    2x+3y = 7 2x+3(0) = 7 ... plug in y = 0 (not x = 0) 2x + 0 = 7 2x = 7 x = ???

  39. hartnn
    • 3 years ago
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    x=3 1/2 is correct, but same note again, intercepts are of the form (x,y) x co-ordinate comes before comma so, would you like to revise your answer ?

  40. carlenstar281
    • 3 years ago
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    No way i got it right and yes :) (3 1/2,0)

  41. hartnn
    • 3 years ago
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    yes, now (3 1/2,0) is correct :)

  42. carlenstar281
    • 3 years ago
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    Thanks again for all your help Im going to go to sleep so i can get up tomorrow again i cant thank you enough you really helped me understand this I know I will ace that test now Thank you!! :)

  43. hartnn
    • 3 years ago
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    i am glad to hear that :) and you are most welcome ^_^

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