2-2 HW = Pg #12-32e, 33-38, 44-50e, 62-78e

2-2 HW Continued

1.) Subtraction can be turned into addition -adding the opposite of the second number is equivalent to subtracting the number 2.) Rules -a - b = a + (-b) -Ex: = 3 + (-5) = -2 Terms = parts of an expression that are separated by addition or subtraction signs - Ex: -9-2x has 2 terms, 2-3 Subtraction of Real Numbers

Important Rules to follow with Addition, DO NOT work for subtraction! Commutative Property Associative Property Property of Zero (Inverse Property) This property STILL works for subtraction Identity Property a – 0 = a

Practice Use the subtraction rule to rewrite the subtraction expression as an equivalent addition expression. Then evaluate the expression. 1.) ) 3-(-8) 3.) ) 2-(-3)-6 5.)

Practice 2 Evaluate the expression 1.) 8-11-(-6)2.) 3-(-8)+(-9)3.) – ) (-8) 5.) Find the terms of the expression 6.) -4-y7.) -3x+68.) x-y-7 Evaluate the function for these values of x: -2, -1, 0, and 1. Organize your results in a table 9.) y = x ) y = -x + 12

Practice 2 - Answers 1.) 8-11-(-6) = 8+(-11)+(+6) = 3 2.) 3-(-8)+(-9) = 3+(+8)+(-9) = 2 3.) – = (-63) = ) (-8) = 6+(-1)+10+(+8) = 23 5.) 6.) -4-y : 2 terms –4 and y 7.) -3x+6 : 2 terms –3x and 6 8.) x-y-7 : 3 terms x, -y and -7 9.) 10.) X-201 Y X-201 Y

When will I ever use this?

Summary Adding the ___________ of a number is equivalent to subtracting the number. The following properties DO NOT work for subtraction _______________, _______________, and _______________. The ___________ ______________ is the only addition property that works for subtraction. The parts in a expression separated by addition symbols are called___________.

Check Yourself Pg #16-70 eoe, Quiz 1 #1-20 and study for Ch.2 Quiz 1 # 16-34: find the difference by changing subtraction to addition of the opposite #36-50: evaluate the expression by substituting first #52-58: find the terms and list them #60-70: evaluate the expression