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03 Jun 2017, 10:17
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C
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Difficulty:
15%
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Question Stats:
76% (00:59) correct
24%
(00:56)
wrong
based on 83
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In the figure below, if the equation of the line is y = px + a, then p =
(A) b/a
(B) −b/a
(C) −a/b
(D) a/b
(E) there is not enough information to decide
(A) b/a
(B) −b/a
(C) −a/b
(D) a/b
(E) there is not enough information to decide
Source: Nova GMAT
Difficulty Level: 550
Difficulty Level: 550
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03 Jun 2017, 10:58
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When we write a line like this: y = px + a .. in that case, 'p' is the slope and 'a' is the y-intercept of this line.
Slope of any line can be calculated by taking the difference of y coordinates and dividing it by the difference of x coordinates.
We already have two points on this line given as: (0,a) and (b,0). Hence slope p = (0-a)/(b-0) = -a/b
Hence C answer
Slope of any line can be calculated by taking the difference of y coordinates and dividing it by the difference of x coordinates.
We already have two points on this line given as: (0,a) and (b,0). Hence slope p = (0-a)/(b-0) = -a/b
Hence C answer
04 Jun 2017, 00:50
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y=px+a
Slope of line(m) =p
m= y2-y1/x2-x1
p=0-a/(b-0)=-a/b
Answer c
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Slope of line(m) =p
m= y2-y1/x2-x1
p=0-a/(b-0)=-a/b
Answer c
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