document.write( "Question 1065853: If f(x)=a+bx,
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Algebra.Com's Answer #681027 by math_helper(2461)\"\" \"About 
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If f(x)=a+bx,
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document.write( "f(x+k) = a+b(x+k)
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document.write( "       = a+bx+bk
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document.write( "f(x)   = a+bx             (<<< subtract this from line above)
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document.write( "f(x+k)-f(x) = bk
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document.write( "Ans:  \"+highlight%28f%28x%2Bk%29-f%28x%29+=+bk%29+\" \n" );
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