Without any equality signs they can't be considered to be equations.
But if you mean: x+2y =12 and y = x+3 then the solution is as follows
x+2y = 12
-x+y = 3
Adding the equations together: 3y = 15 and y = 5
By substitution: x = 2
Solution: x = 2 and y = 5
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2x+7y=29 x=37-8y
It is not possible to know exactly what the question is because the browser used by this site is almost totally useless for mathematical questions: it rejects most symbols. If the equations are 2y + 2x = 20 and y - 2x = 4,then the solution is (2, 8).
cot 81.1°
1/36
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