Download 3.1 +3.2 Solving Equations

3.1 +3.2 Solving Equations
Obj: To solve 1 and two step
equations
Addition/ subtraction property of
equality
A=b
A+b = b +c
A-c = b -c
4=4
4 +2 = 4 +2
6-3 = 6-3
3=3
Multiplication/ Division Property of
Equation
A=b
Ac= bc
a
c
b
=
c
2(4)=(4)2
8
8
=
8
8
1=1
Commathment
“Do unto one side as you do to the
other side”
Example 1
Is x=4 a solution
3x+19=25
3(4)+19=25
12+19=25
31 = 25
Not a solution
Example 2
x-8=5
+8 +8
X =13
operation you do
+
-
-
+
X


X
Change sides you
change signs!!
Example 3
A + 9 = 32
-9
-9
A = 23
Example 4
-9 = - 4 + x
+4 +4
-5 = x
Example 5
4x = 44
4
4
X = 11
Example 6
3x = -12
5
5 • -3x = 5 • -12
5
-3x = -60
-3
-3
X = 20