Unit+5+Inequalities

Unit 5: Inequalities

Always change the inequality sign when you divided or multiplied a negative number. -3x<15 let x stand alone: -3x/-3<15/-3 x**>**-5 not x<-5

let's say x=1 -3(1)<15 -3<15 CORRECT!

x=-10 -3(-10)<15 30<15??? INCORRECT

When writing inequalities in interval notation, remember that means exclusive and [ ] means inclusive. How do I remember? Think of the parenthasis as the curves in the letter "e" and the [ as the straight lines in "i" for inclusive. Or you can think that the [ 's are "sharp on the edges," and they "staple" all of the numbers included together, inclusive.