Subtraction EquationsSubtraction EquationsSWBAT solve subtraction SWBAT solve subtraction

equations using the addition equations using the addition property of equality when the property of equality when the minuend is unknown; solve minuend is unknown; solve subtraction equations using subtraction equations using

the addition property of the addition property of equality when the subtrahend equality when the subtrahend

is unknownis unknown

Solving EquationsSolving Equations What are the 2 rules you need to What are the 2 rules you need to

remember when solving equations?remember when solving equations?– Keep it balanced!!Keep it balanced!!– Isolate the variableIsolate the variable

What is the inverse (or opposite) What is the inverse (or opposite) operation of subtraction? (How do operation of subtraction? (How do you un-do subtraction)you un-do subtraction)– Addition Addition

Fact FamiliesFact Families 2 + 4 = 62 + 4 = 6 6 – 2 = 46 – 2 = 4 6 – 4 = 26 – 4 = 2

4 + 6 = 10 4 + 6 = 10 10 – 4 = 6 10 – 4 = 6 10 – 6 = 4 10 – 6 = 4

a + b = c a + b = c c - b = a c - b = a c - a = b c - a = b

ExamplesExamples x – 1456 = 234 x – 1456 = 234 58 – z = 29 58 – z = 29 p – (183 + 8462) = 135p – (183 + 8462) = 135 8.7 = e – (107 + 14.3)8.7 = e – (107 + 14.3) 17.82 – b = 17.8217.82 – b = 17.82

Try the problems on your paperTry the problems on your paper t = 19.311 t = 19.311 c = $3.81c = $3.81 b = 4.15b = 4.15 f = 55,317f = 55,317 s = 1594s = 1594