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If: x+y = 15 and y is 7 then by substitution of 7 into the equation x must equal 8

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Q: What does substitution mean in mathematics provide an example?
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In mathematics what does the word difference mean?

The word difference means subtract! Here is an example!Example:7,935- 2,460______5,475


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A slash in mathematics signals division. For example, if you see 4/2 it would mean 4 divided by 2. It also can mean a fraction, but this is less likely. so if you saw 1/2 it would be one half, or if you performed division, 0.5


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