Systems of Linear Equations and Echelon Forms – Lecture 1 (Linear Algebra)

Why does the equation 19x₁ + 3 = -7x₂ + 1 count as a linear equation?

1. A.It rearranges into constants times variables equal to a number
2. B.It contains exactly two variables, the maximum allowed for linearity
3. C.Both sides are already written as constants times variables summed
4. D.Its graph passes through the origin of the standard coordinate plane