The true conditional statement, "if 5x + 7 = 2x - 1, then 3x + 7 = -1," illustrates which property of equality?
addition property of equality
subtraction property of equality
multiplication property of equality
division property of equality

The given condition is:
If 5x + 7 = 2x =1, then 3x + 7 = -1
=> This given equation represent  a subtraction property of equality.
=> 5x +7 =2x-1
=> 5x – 2x + 7 = -1
=> 3x + 7 = -1

What we did was  we subtracted 2x from 5x to get the 3x
Subtraction property of equality is a mathematical process in where we subtract numbers from both sides that contains the same expression.
Like 5x and 2x, since they have the same equation, we both subtracted both numbers and the rest remains as it is.

The graph isn’t that clear