Answer:
it's associatively property of addition
(a+b)+c= a+(b+c)
Answer:
x=5, y=8
Step-by-step explanation:
x+y=13
2x-y=2
add these two equations
3x=15
therefore x=5
apply this value in x+y=13
5+y=13
then y=13-5 = 8
Answer:
12
Step-by-step explanation:
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