If you are talking about building blocks, then you would get one 10 and 3 ones, then subtract that from 7 ones and would get 6
If C = 7, You would do 7-2 = 5
T+6>-4
T -6>-6
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T>-10
That is the answer
5x+6y=18
5x=18-6y
x=(18-6y)/5
Use that in the other equation
18(18-6y)/5 - 15y = 36
64.8-21.6y - 15y = 36
28.8=36.6y
.7868=y
Now put that number in for y on the first equation
5x+6(.78) = 18
5x + 4.68 = 18
5x = 13.32
x = 2.66
and y = .78
