Without an equality sign the given expression can't be considered to be an equation and so therefore it has no answer.
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y = 2x + 1 IS a linear equation!
Yes it is. The thing that makes it a quadratic equation is that "x squared" in there.
The value of X in the equation 2x plus 36 = 4 is -16.
2x + 4 is an expression, not an equation. There can be no solution set for an expression.
2x plus 3y is not an equation, it is an expression.