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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
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I think, I found the solution - ...

if we take the slope as tangent(x) then we notice that 60<x<90, as tan(x)=2 and tan(x)>Sqrt(3)

Now if we take answer choice (E) we get tan(x`)>2 --> angle x`>angle x

the graph g(x)=3x-2 has to cross the graph f at any given time, because of the angle property (x`) and disposition of adjacent (rise in x-coordinate) and opposite (rise in y-coordinate) sides.

all other answer choices could be parallel or placed under the graph {fixed y-coordinate in f(x)} too, they depend on the value of x. We can check simply by plugging in x=0 and x=1 into answer choices A-D.

thanks
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Originally posted by zaur2010 on 28 Mar 2011, 20:41.
Last edited by zaur2010 on 28 Mar 2011, 20:51, edited 1 time in total.
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
Hi guys,

I am actually quite surprised by my capability to even come close to solving this 75% difficulty questions. The only thing I don't understand here is why we're looking for a solution in the 1st quadrant. For example, bagrettin refers to this in his solution.

Answer choices (C) and (D) offer solutions of \(-\frac{1}{2}\) and \(-\frac{7}{4}\) in the x<0 or 2nd quadrant area. Why do we not except these answers here?

Thank you!
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
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Start by checking the slopes and intercepts of all the lines. On comparison with the reference line provided, we see that the first four lines will never intersect with the given line. Only the last line will intersect because it has a steeper slope.
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
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Clearly the option E

we can see that g(x) = 3x-2 is the line which will intersect the given y=|2x|+4 at point (6,16)
and refer to the figure .
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
zaur2010 wrote:
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The figure above shows the graph of a function f, defined by f(x) = |2x| + 4 for all numbers x. For which of the following functions g defined for all numbers x does the graph of g intersect the graph of f ?

A. g(x) = x - 2
B. g(x) = x + 3
C. g(x) = 2x - 2
D. g(x) = 2x + 3
E. g(x) = 3x - 2


Only E. g(x) = 3x - 2 has greater slope = 3 and will intersect the graph of a function f, defined by f(x) = |2x| + 4
Since all other functions has less y-intersect and less than or equal to slope = 2 and will not intersect the graph of a function f, defined by f(x) = |2x| + 4

IMO E
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
zaur2010 wrote:
Attachment:
pic.JPG
The figure above shows the graph of a function f, defined by f(x) = |2x| + 4 for all numbers x. For which of the following functions g defined for all numbers x does the graph of g intersect the graph of f ?

A. g(x) = x - 2
B. g(x) = x + 3
C. g(x) = 2x - 2
D. g(x) = 2x + 3
E. g(x) = 3x - 2


Given: The figure above shows the graph of a function f, defined by f(x) = |2x| + 4 for all numbers x.
Asked: For which of the following functions g defined for all numbers x does the graph of g intersect the graph of f ?

For intersection at all values of x, f(x) = g(x) is valid for all x

A. g(x) = x - 2
f(x) = |2x| + 4 = g(x) = x-2
|2x| = x - 6
If x>0 ; 2x = x - 6; x = - 6; Not valid since x>0
If x<0; -2x = x- 6; 3x = 6; x = 2; Not valid since x<0

B. g(x) = x + 3
f(x) = |2x| + 4 = g(x) = x + 3
|2x| = x -1
If x>0; 2x = x-1; x = -1; Not valid since x>0
If x<0; -2x = x - 1; 3x = 1; x = 1/3; Not valid since x<0

C. g(x) = 2x - 2
f(x) = |2x| + 4 = g(x) = 2x-2
|2x| = 2x - 6
If x>0; 2x = 2x - 6; 0 = -6; Not valid
If x<0; -2x = 2x - 6; 4x = 6; x = 1.5; Not valid since x<0

D. g(x) = 2x + 3
f(x) = |2x| + 4 = g(x) = 2x + 3
|2x| = 2x -1
If x>0; 2x = 2x - 1; 0 = -1; Not valid
If x<0; -2x = 2x - 1; 4x = 1; x = 1/4; Not valid since x<0

E. g(x) = 3x - 2
f(x) = |2x| + 4 = g(x) = 3x - 2
|2x| = 3x -6
If x>0; 2x = 3x - 6; x = 6; Valid solution since x>0
If x<0; -2x = 3x -6 ; 5x = 6; x = 6/5 ; Not valid since x<0

Only E. g(x) = 3x -2 has a valid solution x = 6

IMO E
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
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Re: The figure above shows the graph of a function f, defined by f(x) = |2 [#permalink]
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