csciahetano
05.09.2020 •
Mathematics
Help please
Please explain if possible.
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Ответ:
(20+9)+12
9+(20+12)
(9+12)+20
Explanation:
The associative property of addition is saying that if three or more numbers are added, the answer won’t change if you add or move parentheses.
So if the question is 1+2+3, the answer will be the same even if you write it as (1+2)+3 or 1+(2+3) or 2+(1+3) and so on.
Ответ:
You should multiply the first equation by 3/2.
Step-by-step explanation:
Multiplying the first equation by 3/2 allows you to get the y term in the first equation to +3. Then you subtract it from the second equation and the y-term will be eliminated.