Two Step Equations 7-1
Use the Addition Property of Equality or the Subtraction Property of Equality to get rid of addition or subtraction
+prop =
-prop =
Then use the Multiplication Property of Equality or the Division Property of Equality to get rid of multiplication or division
xprop =
÷prop=
This is the opposite of Aunt Sally because for solving equations you must work backwards-- or go in reverse!!
3x + 7 = 28
Subtract seven from both sides
-7 = -7 you subtract 7 form both sides so you used the -prop =
3x = 21
NOW Divide both sides by 3
3x/3 = 21/3
x = 7
CHECKING a 2 step equation
You need 3 steps to check also
1) rewrite the equation
3x + 7 = 28
2) substitute your answers and put a "?" over the "="
3) DO THE MATH!! use order of operations
3(7) + 7 ? 28
21 + 7 ? 28
28 = 28
Saturday, October 11, 2008
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