The numerical coefficient of y in 5y is 5. In an algebraic term, the coefficient is the number that is directly multiplied by the variable. In this case, y is being multiplied by 5, making 5 the coefficient of y in the term 5y.
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5y - y = 4y
y+5y
You need 2 full equations to answer that, or the number for x and what it equals. Without that information that is insolvable.
In mathematics, a numerical coefficient is a constant factor in a term of an algebraic expression. For example, in the term 5x, the numerical coefficient is 5. In the expression 2y^2, the numerical coefficient is 2. Numerical coefficients can be positive, negative, integers, fractions, or even irrational numbers.
The simplified term is 10x2y so that the coefficient is 10.