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find f+g, for f(x)=3x-6 and g(x)=4x+1
\n" ); document.write( "this is simple substitution
\n" ); document.write( "f+g
\n" ); document.write( "(3x-6)+(4x+1)
\n" ); document.write( "(7x-5) is the answer
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document.write( "to check this answer simply make up a value for x
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document.write( "if x=1
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document.write( "f=3(1)-6=3-6=-3
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document.write( "g=4(1)+1=4+1=5
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document.write( "f+g=5+(-3)=2
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document.write( "if (7x-5)=f+g
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document.write( "then(7(1)-5)=7-5=2
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document.write( "2=2
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document.write( "correct