Question

Pls help i thought i understood it but it was incorrect the first time

Answer 1

Answer: Choice D

Subtraction property of equality

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Reason:

We subtract 18 from both sides to go from 4x+18 = 78 to 4x = 60

So we use the aptly named subtraction property of equality.

In general that rule is if a = b, then a-c = b-c