anonymous
  • anonymous
How do you find the x intercept??
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Substitute y=0
anonymous
  • anonymous
and solve for x
anonymous
  • anonymous
its a graph

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anonymous
  • anonymous
|dw:1346933260713:dw|
anonymous
  • anonymous
how do you find the x intercept of l?
anonymous
  • anonymous
LET f(x)=0 then solve for x
anonymous
  • anonymous
In this case, 0=10^x
anonymous
  • anonymous
im trying to find the x intercept of the unknown line, not f(x)=10^x
anonymous
  • anonymous
@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...
anonymous
  • anonymous
So first find the equation of the line
anonymous
  • anonymous
@emilyoo Does the line and the curve intersect each other on the same point on the y axis?
anonymous
  • anonymous
yes
anonymous
  • anonymous
at (0,1)
anonymous
  • anonymous
and at (log2,2) i think. thats all i know so far
hartnn
  • hartnn
thats correct, @emilyoo so now u have 2 points on that line,can u find the equation of that line?
anonymous
  • anonymous
i got y-1=log2(x)
anonymous
  • anonymous
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
anonymous
  • anonymous
i dont understand how you change the equation in the form x/a+b/b=1... what is b supposed to represent?
anonymous
  • anonymous
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
hartnn
  • hartnn
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 ??
anonymous
  • anonymous
sorry divide the eqn on both the sides
anonymous
  • anonymous
@emilyoo did you get it now
anonymous
  • anonymous
ohh...ok i got it now
anonymous
  • anonymous
thank you so much
hartnn
  • hartnn
welcome :)

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