9514 1404 393
Answer:
- A Subtract the bottom equation from the top equation.
- B Add the equations.
Step-by-step explanation:
The x-terms are the same in each equation, so subtracting one equation from the other will eliminate the x-variable.
The y-terms are opposites in the two equations, so adding the two equations will eliminate the y-variable.
Both strategies (subtracting, adding) are applicable to this system of equations.
9 × (5 × 2) = (9 × 5) × 2
You can see that all the numbers are there and in the same order. The only thing that changed is the parentheses location.
This is called the Associative Property (of Multiplication, because you're multiplying).
