Solving equations in two unknowns requires two independent equations. Since you have only one equation there is no solution.
it is a linear equation in 2 variables
They can be but need not be.
(0, ), (2, ), ( , 0)
4 2 4
8
x=4 y=4
x = y = 0 ?
x = 0 and y = 4
y equals x plus 4 when y equals 0 then x equals 2i i is the square root of negative 1
symmetric property
Symmetry, which states that if A = B then B = A Put A = 4 and B = x + y
If X+Y=5;X=4, then x=4 and y=1
x=4 y=0
4
x=4 y=x+3 y=4+3 y=7
x = 2y = 4