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09 Nov 2015, 00:08
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y = 248 - 398x
Which of the following values of x gives the greatest value of y in the equation above?
(A) 200
(B) 100
(C) 0.5
(D) 0
(E) -1
Which of the following values of x gives the greatest value of y in the equation above?
(A) 200
(B) 100
(C) 0.5
(D) 0
(E) -1
09 Nov 2015, 02:25
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(A) 200
y= 248 - 398*200
= big negative number
(B) 100
y= 248 - 398*100
=negative number but smaller than A
(C) 0.5
y= 248 - 398*.5
= 248 - 199
= 49
(D) 0
y=248
(E) -1
y=248 - (398*-1)
=248+398
=646
Answer E
y = 248 - 398x
Value of y will depend on both sign and absolute value of x .
As value of x increases , then values of y will decrease . Since , there is only one negative number x=-1 in the choices , value of y will be maximum for that .
y= 248 - 398*200
= big negative number
(B) 100
y= 248 - 398*100
=negative number but smaller than A
(C) 0.5
y= 248 - 398*.5
= 248 - 199
= 49
(D) 0
y=248
(E) -1
y=248 - (398*-1)
=248+398
=646
Answer E
y = 248 - 398x
Value of y will depend on both sign and absolute value of x .
As value of x increases , then values of y will decrease . Since , there is only one negative number x=-1 in the choices , value of y will be maximum for that .
09 Nov 2015, 07:07
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Clearly, the negative value of x will result in maximum value of y.
Don't even look at the rest of the answer choices as only one negative value is being present.
Answer is E
Don't even look at the rest of the answer choices as only one negative value is being present.
Answer is E
