document.write( "Question 1206309: How to represent -2+(-7) on a number line \n" ); document.write( "
Algebra.Com's Answer #843675 by math_tutor2020(3817)\"\" \"About 
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\n" ); document.write( "Some students may prefer horizontal number lines.
\n" ); document.write( "Other students may prefer vertical number lines.\r
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\n" ); document.write( "\n" ); document.write( "If you like the 1st option, then start at -2.
\n" ); document.write( "Then move 7 units left to arrive at -9\r
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\n" ); document.write( "\n" ); document.write( "If you prefer a vertical number line, then start at -2 and move down 7 units to arrive at -9.\r
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\n" ); document.write( "\n" ); document.write( "Here are some real world applications of how to interpret -2 + (-7) = -9
  • You are 2 meters under the ocean's surface. Going down another 7 meters will produce a final depth of 9 meters below the surface.
  • Your car is parked on the basement 2 level (B2) of a parking garage. Your friend parked his car 7 floors beneath yours, so his car is on level B9.
  • The temperature is -2 degrees C. After the temperature lowers by 7 degrees, it is now -9 degrees C.
  • You are 2 dollars in debt. This is represented by -2. Borrowing 7 more dollars brings the total debt to $9

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