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6y - 3g + 2y - 4g
Rearrange the terms to get the ones with y together and the ones with
g together
6y + 2y - 3g - 4g
Factor y out of the first two terms and -g out of the last two:
y(6+2) - g(3+4)
Add 6+2 and get 8. Add 3+4 and get 7
y(8) - g(7)
Put the number left of the letter using the commutative principle
8y - 7g
The others are done the same way.
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Edwin
