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Writing basic expressions with variables

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Learn to write expressions for phrases like "3 more than x."

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Solving system of equations by substitution

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Solving systems of equations with substitution

Solving systems of equations with substitution

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Systems of equations with substitution (practice) | Khan Academy

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Factoring

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Distributive property with variables (negative numbers)

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Factor and expand expressions like -3x-9 by applying the distributive property. Expressions include variables and negative numbers.

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Finding distance on a coordinate plane

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Distance between points: vertical or horizontal

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Practice finding the distance between two points on the coordinate plane that share the same x- or y-coordinate.