Answer:
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Step-by-step explanation:
Answer: Commutative Property of Multiplication
<u>Step-by-step explanation:</u>
Commutative property is when two terms trade places.
(a · 3) × b = b × (a · 3)
Notice that (a · 3) switched places with b
Given:X: The blue marbles.
3X: The red marbles.
A box contains
144 marbles.
SOLVING:X + 3X = 144
4X = 144
X =

X = 36
===> The blue marbles.If there are
3 times as many red marbles as there are blue marbles:
3(36) = 108
===> The red marbles. SOLUTION
TESTING:

GOOD LUCK...!!!
Solve both equations for y:

Set the expressions equal to each other:

So, for every nonzero number a the system of equations has
one solution.