1956 AMC 12 Problem 41

Attempt Problem 41 of the 1956 AMC 12 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1956 AMC 12 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

41.

The equation 3y2+y+4=2(6x2+y+2)3y^2+y+4=2(6x^2+y+2) where y=2xy=2x is satisfied by:
no value of xx
all values of xx
x=0x=0 only
all integral values of xx only
all rational values of xx only
Answer: C
Concepts:substitutionquadratic cancellationlinear equation
Small hint:
Substitute y=2xy=2x on both sides before expanding
Big hint:
The 12x212x^2 and constant terms cancel
Solution:
Substituting y=2xy=2x gives 12x2+2x+4=12x2+4x+4. 12x^2+2x+4=12x^2+4x+4. Cancelling the common quadratic and constant terms leaves 2x=4x,2x=4x, so x=0.x=0. This value satisfies both equations.
Thus, the correct answer is C.
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