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Identify the property illustrated in each statement 1. If X + 5 = 12, then X = 7 . 2. If x + y = 20, and y = 5, then x + 5 = 20. 3. If 2x − 3 = 11, then 11 = 2x − 3. 4. If x + 5 = 6, then 3x + 15 = 18.

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1.If x+5=12

so,x+5-5=12-5

x=7

2.If x+y=20,and y=5

so,x+y=x+5=20

then x+5=20 [substitute y into the equation]

3.If 2x-3=11,

so,11=2x-3 [change of position

4.If x+5=6

so,3(x+5)=3x6 [x=y,3x=3y]

3x+15=18

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