How do you solve the following system: #2x+7y=1, 6x + 7y = -9 #?
By arranging it, it can be calculated that
The first equation can be rewritten
Combine these two equations:
Now put value in the first original equation:
The answer is
Note that the number of
The difference in the the totals therefore represents the difference in the number of
Check in A:
This is correct.