document.write( "Question 614905: a country's population in 1991 was 147 million. In 1998 it was 153 million what's the population in 2017 \n" ); document.write( "

Algebra.Com's Answer #386786 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Plot population in millions on the vertical axis, call it $\"+p+\"$
\n" ); document.write( "Plot the year on the horizontal axis, call it $\"+t+\"$
\n" ); document.write( "Call 1990 $\"0\"$
\n" ); document.write( "The slope is:
\n" ); document.write( " $\"+%28+153+-+147+%29+%2F+%28+1998+-+1991+%29+=+6%2F7+\"$
\n" ); document.write( "The equation so far is:
\n" ); document.write( " $\"+p+=+%286%2F7%29%2At+%2B+b+\"$
\n" ); document.write( "Plug in the point ( 1, 147 )
\n" ); document.write( " $\"+147+=+%286%2F7%29%2A1+%2B+b+\"$
\n" ); document.write( " $\"+1029+=+6+%2B+7b+\"$
\n" ); document.write( " $\"+7b+=+1023+\"$
\n" ); document.write( " $\"+b+=+146.14+\"$
\n" ); document.write( "The equation is $\"+p+=+%286%2F7%29%2At+%2B+146.14+\"$
\n" ); document.write( "In 2017,
\n" ); document.write( " $\"+p+=+%28+6%2F7+%29%2A27+%2B+146.14+\"$
\n" ); document.write( " $\"+p+=+23.143+%2B+146.143+\"$
\n" ); document.write( " $\"+p+=+169.286+\"$
\n" ); document.write( "The population in 2017 will be 169,286,000
\n" ); document.write( "check:
\n" ); document.write( "The slope should be 6/7
\n" ); document.write( " $\"+%28+169.286+-+153+%29+%2F+%28+27+-+8+%29+\"$
\n" ); document.write( " $\"+16.286+%2F+19+=+.8572+\"$
\n" ); document.write( " $\"+6%2F7+=+.8571+\"$
\n" ); document.write( "close enough \n" ); document.write( "

\n" );