document.write( "Question 116727This question is from textbook
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document.write( ": 17 -(4k - 2) > 2 (k + 3) \n" );
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Algebra.Com's Answer #84874 by bucky(2189)![]() ![]() ![]() You can put this solution on YOUR website! You can work these problems pretty much following the same rules as you would for solving an \n" ); document.write( "equation. The inequality sign is similar to the equal sign in the equation in separating \n" ); document.write( "the two sides from each other. There is an exception, however. If you multiply or divide \n" ); document.write( "both sides of the inequality by a negative quantity, you reverse the direction of the inequality \n" ); document.write( "sign. \n" ); document.write( ". \n" ); document.write( "So let's begin using the processes we would use for solving if the given problem were an equation. \n" ); document.write( "Start with the given: \n" ); document.write( ". \n" ); document.write( "17 -(4k - 2) > 2*(k + 3) \n" ); document.write( ". \n" ); document.write( "On the right side, do the distributed multiplication to get: \n" ); document.write( ". \n" ); document.write( "17 -(4k - 2) > 2k + 6 \n" ); document.write( ". \n" ); document.write( "On the left side remove the parentheses. However, since the parentheses are preceded by \n" ); document.write( "a minus sign, when you remove the parentheses you change the signs of the two terms inside \n" ); document.write( "the parentheses to get: \n" ); document.write( ". \n" ); document.write( "17 - 4k + 2 > 2k + 6 \n" ); document.write( ". \n" ); document.write( "Now, as in solving an equation, we try to collect the terms with the variable k on one side \n" ); document.write( "of the > sign and all the numerical terms on the other side. Begin by subtracting 2k \n" ); document.write( "from both sides of the inequality to get rid of the 2k on the right side. This subtraction \n" ); document.write( "reduces the inequality to: \n" ); document.write( ". \n" ); document.write( "17 - 6k + 2 > 6 \n" ); document.write( ". \n" ); document.write( "On the left side combine the 17 and the +2 to get 19: \n" ); document.write( ". \n" ); document.write( "19 - 6k > 6 \n" ); document.write( ". \n" ); document.write( "Get rid of the 19 on the left side by subtracting 19 from both sides: \n" ); document.write( ". \n" ); document.write( "-6k > -13 \n" ); document.write( ". \n" ); document.write( "Solve for k by dividing both sides by -6. However, recall the rule that if you divide both \n" ); document.write( "sides by a negative quantity, you reverse the direction of the inequality sign. So dividing \n" ); document.write( "both sides by -6 results in: \n" ); document.write( ". \n" ); document.write( "k < 13/6 \n" ); document.write( ". \n" ); document.write( "That is the answer to this problem. The original inequality will be true if k is less than 13/6. \n" ); document.write( ". \n" ); document.write( "Let's try it to help verify. If we let k = 2 (which is slightly less than 13/6) then the \n" ); document.write( "original inequality becomes: \n" ); document.write( ". \n" ); document.write( "17 - (8 - 2) > 2(2 + 3) \n" ); document.write( ". \n" ); document.write( "Combine the terms in the parentheses on both sides to get: \n" ); document.write( ". \n" ); document.write( "17 - (6) > 2(5) \n" ); document.write( ". \n" ); document.write( "Do the math. On the left side 17 - 6 = 11 and on the right side 2*5 = 10. So when k = 2 \n" ); document.write( "the inequality is: \n" ); document.write( ". \n" ); document.write( "11 > 10 \n" ); document.write( ". \n" ); document.write( "That is true. To further check the answer you might want to try letting k = 3 (which is \n" ); document.write( "not less than 13/6) and see what the original inequality becomes when k is that value. \n" ); document.write( "You should find that the resulting inequality is not true ... showing that if k is bigger than \n" ); document.write( "13/6 the inequality will not work. \n" ); document.write( ". \n" ); document.write( "Hope this helps you to understand how to work problems such as these. Don't forget the \n" ); document.write( "rule about reversing the direction of the inequality sign if you multiply or divide both \n" ); document.write( "sides by a negative quantity. \n" ); document.write( ". \n" ); document.write( " |