What property is used in the second step of solving the inequality below? 5x-9

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What property is used in the second step of solving the inequality below? 5x-9 <91 (GIVEN) 5x < 100 (???) x <20 (MULTIPLICATION PROPERTY) a. Identity Property b. Addition Property c. Multiplication Property d. Transitive Property

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5x – 9 <91 --- given
5x – 9 + 9 <91 + 9
5x <100 --- extra property during the period I added 9 to each side
x <100 * 1/5 --- multiplication property
x <20 so, step 2, we used the extra property