X + y = z
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by elimination,substitution or through the matrix method.
In mathematics substitution is when one term in an equation is replaced by another that has a known value. This is so that the equation itself can be resolved.
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.
An equation that makes a straight line when it is graphed. Often written in the form: y = mx+b
There is not Substitution Property of Congruence. There is, however, one for Equality, called the Substitution Property of Equality.