What is the missing reason for line 5 in this proof? LZM Given: LM = 12; LZ = 3x: MZ = x
Prove: LZ = 9
Reason
1.
2.
3.
Statement
1. LM= 12; LZ = 3x: MZ = x
2. LZ + MZ = LM
3. 3x + x = 12
4. 4x = 12
5. (4= 4)X = 12 - 4
6. X= 3
7. LZ = 3(3)
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