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anonymous

  • one year ago

Help please =*( Line K is in the rectangular coordinate system. If line K is defined by the equation 3y=2x+6 and line K intersects the x-axis at point (a, b), then what is the value of a?

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  1. anonymous
    • one year ago
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    answer or step-by-step?

  2. anonymous
    • one year ago
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    Okay i know the answer to this i need to know why we multiply the Y by 0 instead of the y-intercept.

  3. Nnesha
    • one year ago
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    y-coordinate = 0 not y-intercept

  4. anonymous
    • one year ago
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    ook... don't know why Y gets multiplied by 0 in your given solution... but maybe it was smth like: any point on x axis is (x, 0)

  5. Nnesha
    • one year ago
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    like i said yesterday (a,b) <--- b is y-coordinate not y-intercept (b)

  6. anonymous
    • one year ago
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    So why is it 3(0)=2(a)+6 instead of 3=2(a)+0

  7. Nnesha
    • one year ago
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    yep right

  8. anonymous
    • one year ago
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    So you need the y-intercept to find the x-intercept?

  9. Nnesha
    • one year ago
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    not the y-intercept y-coordinate that's what you need

  10. anonymous
    • one year ago
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    But in this case we multiplied the coordinate by 0 and used the y-intercept to find the solution

  11. Nnesha
    • one year ago
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    |dw:1439308325786:dw| to find x-intercept replace y for 0 always!!

  12. Nnesha
    • one year ago
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    |dw:1439308403560:dw|

  13. anonymous
    • one year ago
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    we didn't multiply the coordinate. actually, we used the 2nd relation of a formed system of equations (we didn't write the system) . that equation is : y = 0 (and, implicitly, x = a) , the equation of the x axis

  14. anonymous
    • one year ago
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    |dw:1439308484644:dw|

  15. anonymous
    • one year ago
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    the y-coordinate was made 0 not the y-intercept

  16. Nnesha
    • one year ago
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    :=) ye

  17. anonymous
    • one year ago
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    so to find the x-intercept make the y-coordinate a 0 not the y-intercept?

  18. Nnesha
    • one year ago
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    yep right

  19. anonymous
    • one year ago
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    okay thanks Nnesha!

  20. Nnesha
    • one year ago
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    my pleasure :=)

  21. Nnesha
    • one year ago
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    i forgot to tell you something there is one situation when y-coordinate = y-intercept only when x=0 if slope of line is 2 passes through the point( 0 ,4) where x=0 y =4 thats mean y-intercept is also 4 you don't need to plug in x and y value to solve for b ONLY WHEN x=0 (0,8) <--y-intercept = 8 =y-coordinate

  22. anonymous
    • one year ago
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    okay got it thanks <33333

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