When the equation represents a horizontal line.
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An identity. If you add y to both sides, you get 2x = 2y x = y
A linear equation has no higher powers than 1. This is linear.
When it is a linear equation.
It is a linear equation.
If two variables are related, then the simplest relationship between them is a linear one. The linear equation expresses such a relationship.If two variables are related, then the simplest relationship between them is a linear one. The linear equation expresses such a relationship.If two variables are related, then the simplest relationship between them is a linear one. The linear equation expresses such a relationship.If two variables are related, then the simplest relationship between them is a linear one. The linear equation expresses such a relationship.