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emilyoo

  • 3 years ago

How do you find the x intercept??

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  1. sauravshakya
    • 3 years ago
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    Substitute y=0

  2. sauravshakya
    • 3 years ago
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    and solve for x

  3. emilyoo
    • 3 years ago
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    its a graph

  4. emilyoo
    • 3 years ago
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    |dw:1346933260713:dw|

  5. emilyoo
    • 3 years ago
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    how do you find the x intercept of l?

  6. sauravshakya
    • 3 years ago
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    LET f(x)=0 then solve for x

  7. sauravshakya
    • 3 years ago
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    In this case, 0=10^x

  8. emilyoo
    • 3 years ago
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    im trying to find the x intercept of the unknown line, not f(x)=10^x

  9. punnus
    • 3 years ago
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    @emilyoo in any question intercept means the point of intersection with the respective ... In this case you want the x intercept of l... the equation of l is \[10^{x}\] Now for what value of x will will i be zero... Now apply limit to the function of yuors and solve it for -infinity This will give you the x intercept of the curve...

  10. sauravshakya
    • 3 years ago
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    So first find the equation of the line

  11. punnus
    • 3 years ago
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    @emilyoo Does the line and the curve intersect each other on the same point on the y axis?

  12. emilyoo
    • 3 years ago
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    yes

  13. emilyoo
    • 3 years ago
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    at (0,1)

  14. emilyoo
    • 3 years ago
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    and at (log2,2) i think. thats all i know so far

  15. hartnn
    • 3 years ago
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    thats correct, @emilyoo so now u have 2 points on that line,can u find the equation of that line?

  16. emilyoo
    • 3 years ago
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    i got y-1=log2(x)

  17. punnus
    • 3 years ago
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    then toy can find the equation of the line by using the two point formula of line i.e \[(y-y1)=\frac{ y2-y1 }{ x2-x1 }\times(x-x1)\] And the arrange the equation in the form x/a+b/b=1 and the value of a will be the x intercept of theline

  18. emilyoo
    • 3 years ago
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    i dont understand how you change the equation in the form x/a+b/b=1... what is b supposed to represent?

  19. punnus
    • 3 years ago
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    a and b are nothing but constants. And first solve the two point equation of the line. You will get a euqation in x, y and some constant value. Now take the constant to one side of the equaltiy and x and y to the other. Divide both the sides by the constant no on one side of the equation and you will get that form

  20. hartnn
    • 3 years ago
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    since u have 2 points : (0,1) and (log 2,2) let the equation be y=mx+c. put (0,1)----->c=1 put (log2,2) 2=m log 2 +1 m=1/(log 2) EQUATION :y=(1/log 2)x+1 x - intercept : 0=(1/log 2)x+1 x=-log 2 is the x-intercept. got this ??

  21. punnus
    • 3 years ago
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    sorry divide the eqn on both the sides

  22. punnus
    • 3 years ago
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    @emilyoo did you get it now

  23. emilyoo
    • 3 years ago
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    ohh...ok i got it now

  24. emilyoo
    • 3 years ago
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    thank you so much

  25. hartnn
    • 3 years ago
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    welcome :)

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