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x+y=4 equation

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Numerical solution:

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The solution

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x + y = 4
x+y=4x + y = 4
Simplify
Detail solution
Given the linear equation:
x+y = 4

Looking for similar summands in the left part:
x + y = 4

Move the summands with the other variables
from left part to right part, we given:
x=4−yx = 4 - y
We get the answer: x = 4 - y
The graph
Sum and product of roots [src] 
sum
4 - re(y) - I*im(y)
−re⁡(y)−iim⁡(y)+4- \operatorname{re}{\left(y\right)} - i \operatorname{im}{\left(y\right)} + 4 
=
4 - re(y) - I*im(y)
−re⁡(y)−iim⁡(y)+4- \operatorname{re}{\left(y\right)} - i \operatorname{im}{\left(y\right)} + 4 
product
4 - re(y) - I*im(y)
−re⁡(y)−iim⁡(y)+4- \operatorname{re}{\left(y\right)} - i \operatorname{im}{\left(y\right)} + 4 
=
4 - re(y) - I*im(y)
−re⁡(y)−iim⁡(y)+4- \operatorname{re}{\left(y\right)} - i \operatorname{im}{\left(y\right)} + 4 
4 - re(y) - i*im(y)
Rapid solution [src] 
x1 = 4 - re(y) - I*im(y)
x1=−re⁡(y)−iim⁡(y)+4x_{1} = - \operatorname{re}{\left(y\right)} - i \operatorname{im}{\left(y\right)} + 4 
x1 = -re(y) - i*im(y) + 4
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