7. $5 \underline{x}-4=21$
8. $42=6+9 x$
9. $8-2 x=10$
10. $22=3 x-5$
11. $\overrightarrow{5}=5 x-20$
12. $5 x-3=28$

They are the commutative, associative, multiplicative identity and distributive properties.
Commutative property: For example 6 * 7 = 7 * 6;
Associative Property: For example (7 * 8) * 9 = 7 * (8 * 9);
Multiplicative Identity Property: For example 6 * 1 = 6 or, 1 * 6 = 6;
Distributive property: For example 6 * ( 7 + 8) = 6 * 7 + 6 * 8 or, ( 7 + 8) * 6 = 7 * 6 + 8 * 6.

Answered by crisforp | 2024-06-10

Multiplication has key properties including the commutative, associative, multiplicative identity, and distributive properties. By using a number line from 0 to 27, we illustrated examples with the numbers 6, 7, 8, and 9 to demonstrate these properties. This approach helps learners see how multiplication operates systematically and consistently in mathematics.
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Answered by crisforp | 2024-10-02