Systems of Linear Equations with No Solution - Definition & Practice

$y = mx + b\\ y = mx + c\\ y = mx + d\\ (b \neq c \neq d)$

$y + 3x = 5\\ 9x + 15 = -3y + 30$

$x = y\\ x = 2y$

All of these systems have no solution

None of these systems have no solution (i.e., all of these systems have at least one solution)