x can have any value in the domain.
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It is an equation and the value of x is 4
If you mean: 2x+5+3x = 25 then the value of x works out as 4
If x = 4 and y = 2 then 4(5+2) = 28
2x+y = 10 x +y = 4 Subtract bottom equation from top equation: x = 6 Substitute the value of x into the equations to find the value of y: x = 6 and y = -2
That is the value called the y intercept - value of y when x = 0 for example if y = 3x + 4 b = 4 and y = 4 when x = 0