Saturday, December 4, 2010

Please solve -4-5v

But when you multiply both sides of an inequality by a negative number, you reverse the inequality.  So the answer is v>5


Note this example, if answer were v < 5 :


suppose v=1;


then -4 -(5x1)<-29


-4 - 5 < -29


-9 < -29--which is not true.


But suppose v is a number greater than 5, like 6:


-4 - (5x6) < -29


-4 - (30) < -29


-34 < -29.


and just to be sure, let's make sure v cannot equal 5:


-4 - (5-5) < -29


-4 - (0) < -29


-4 < -29--not true, so that's settled.


To recap then, solve -4 - 5v < -29 like this:


-4 - (5v) < -29


-5v < -29 +4


-5v < -25


(-1/5)5v < -25(-1/5)


when multiplying both sides of an inequality by a negative number, you need to flip the inequality


v > 5

No comments:

Post a Comment

What is the main function of the fool in &quot;King Lear&quot;? What is the secondly function?

The fool as a character is confusing, but part of this is the difference between the 1600s and today, as well as the difference in place. If...