"x" stands for any unknown or variable quantity; 3x means 3 times this quantity.
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No, an equation needs an "=".
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In a mathematical sense, 3x isn't an equation, but an expression. In this expression, 3 is a coefficnet.
3x-5y=15 The equation-5y=15-3x Subtract 3x from both sidesy=-3+.6x Divide both sides by -5
Yes, the equation 3x = 8y is a linear equation. A linear equation is an algebraic equation in which each term is either a constant or the product of a constant and a single variable raised to the first power. In this case, both 3x and 8y fit this definition, making it a linear equation.