Decide what can be used to determine the equation of a line when you have two points, but no slope.

Use the slope formula with the two points to calculate the slope: m = (y₂ − y₁)/(x₂ − x₁). Then substitute that slope and either point into a line equation, such as point-slope form, to determine the equation. So the correct choice is “slope formula, then use one of the given points to find the equation.”

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