What is the condition for two linear equation to be independent?

or:What is the condition for two linear equation to be independent?or:Slope is rise over run. Run is horizontal distance, left to right. Run is alway

or:What is the condition for two linear equation to be independent?

or:Slope is rise over run. Run is horizontal distance, left to right. Run is always positive because we always go left to right. Rise is the vertical change in that same distance. A negative rise means it drops. Parallel lines have the same slope. Perpendicular lines have negative reciprocal slopes. Any other combination of slopes indicates independent lines.

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